| opsonisation | (noun) process whereby opsonins make an invading microorganism more susceptible to phagocytosis | Synonyms: opsonization |
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| opsonization | (noun) process whereby opsonins make an invading microorganism more susceptible to phagocytosis | Synonyms: opsonisation |
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| orison | (noun) reverent petition to a deity | Synonyms: petition, prayer |
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| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| outsole | (noun) the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground | - |
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| parasol | (noun) a handheld collapsible source of shade | Synonyms: sunshade |
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| parisology | (noun) the use of ambiguous words | - |
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| parson | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, pastor, rector |
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| parsonage | (noun) an official residence provided by a church for its parson or vicar or rector | Synonyms: rectory, vicarage |
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| partsong | (noun) a song with two or more voice parts | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| perissodactyl | (noun) placental mammals having hooves with an odd number of toes on each foot | Synonyms: odd-toed ungulate, perissodactyl mammal |
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| person | (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: individual, mortal, somebody, someone, soul |
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| (noun) a human body (usually including the clothing) | - |
| (noun) a grammatical category used in the classification of pronouns, possessive determiners, and verb forms according to whether they indicate the speaker, the addressee, or a third party | - |
| persona | (noun) (Jungian psychology) a personal facade that one presents to the world | Synonyms: image |
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| (noun) an actor's portrayal of someone in a play | Synonyms: character, part, role, theatrical role |
| personableness | (noun) the complex of attributes that make a person socially attractive | - |
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| personage | (noun) another word for person; a person not meriting identification | - |
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| (noun) a person whose actions and opinions strongly influence the course of events | Synonyms: important person, influential person |
| personal | (noun) a short newspaper article about a particular person or group | - |
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| personality | (noun) the complex of all the attributes--behavioral, temperamental, emotional and mental--that characterize a unique individual | - |
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| (noun) a person of considerable prominence | - |
| personalty | (noun) movable property (as distinguished from real estate) | Synonyms: personal estate, personal property, private property |
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| personation | (noun) imitating the mannerisms of another person | Synonyms: impersonation |
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| (noun) acting the part of a character on stage; dramatically representing the character by speech and action and gesture | Synonyms: characterization, enactment, portrayal |
| personhood | (noun) being a person | - |
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| personification | (noun) the act of attributing human characteristics to abstract ideas etc. | Synonyms: incarnation |
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| (noun) representing an abstract quality or idea as a person or creature | Synonyms: prosopopoeia |
| (noun) a person who represents an abstract quality | - |
| personnel | (noun) group of people willing to obey orders | Synonyms: force |
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| (noun) the department responsible for hiring and training and placing employees and for setting policies for personnel management | Synonyms: personnel department, personnel office, staff office |
| peso | (noun) the basic unit of money in Colombia; equal to 100 centavos | Synonyms: Colombian peso |
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| (noun) the basic unit of money in Cuba; equal to 100 centavos | Synonyms: Cuban peso |
| (noun) the basic unit of money in the Dominican Republic; equal to 100 centavos | Synonyms: Dominican peso |
| (noun) the basic unit of money in Mexico; equal to 100 centavos | Synonyms: Mexican peso |
| (noun) the basic unit of money in the Philippines; equal to 100 centavos | Synonyms: Philippine peso |
| (noun) the basic unit of money in Uruguay; equal to 100 centesimos | Synonyms: Uruguayan peso |
| (noun) the basic unit of money in Chile; equal to 100 centesimos | Synonyms: Chilean peso |
| (noun) the basic unit of money in Guinea-Bissau; equal to 100 centavos | Synonyms: Guinea-Bissau peso |
| philosopher | (noun) a specialist in philosophy | - |
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| (noun) a wise person who is calm and rational; someone who lives a life of reason with equanimity | - |
| philosophicalness | (noun) The state or quality of having the attitude of a philosopher; specifically, of being calm or unflinching in the face of trouble, defeat, or loss. | - |
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| philosophiser | (noun) someone who considers situations from a philosophical point of view | Synonyms: philosophizer |
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| philosophizer | (noun) someone who considers situations from a philosophical point of view | Synonyms: philosophiser |
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| philosophizing | (noun) the exposition (often superficially) of a particular philosophy | - |
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| philosophy | (noun) the rational investigation of questions about existence and knowledge and ethics | - |
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| (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: doctrine, ism, philosophical system, school of thought |
| (noun) any personal belief about how to live or how to deal with a situation | - |
| physostegia | (noun) any of various plants of the genus Physostegia having sessile linear to oblong leaves and showy white or rose or lavender flowers | - |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| plainsong | (noun) (Roman Catholic Church) a liturgical chant consisting of a single, unaccompanied melodic line | Synonyms: plainchant |
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| plessor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: percussor, plexor |
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| plimsoll | (noun) a light gym shoe with a rubber sole and a canvas top | - |
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| podsol | (noun) a soil that develops in temperate to cold moist climates under coniferous or heath vegetation; an organic mat over a grey leached layer | Synonyms: podsol soil, podsolic soil, podzol, podzol soil |
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| poison | (noun) anything that harms or destroys | - |
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| (noun) any substance that causes injury or illness or death of a living organism | Synonyms: poisonous substance, toxicant |
| poisonberry | (noun) Eurasian herb naturalized in America having white flowers and poisonous hairy foliage and bearing black berries that are sometimes poisonous but sometimes edible | Synonyms: black nightshade, common nightshade, poison-berry, Solanum nigrum |
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| poisoner | (noun) someone who kills with poison | - |
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| poisoning | (noun) the act of giving poison to a person or animal with the intent to kill | - |
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| (noun) the physiological state produced by a poison or other toxic substance | Synonyms: intoxication, toxic condition |
| polysomy | (noun) congenital defect of having one or more extra chromosomes in somatic cells | - |
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| posology | (noun) the pharmacological determination of appropriate doses of drugs and medicines | - |
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| possessor | (noun) a person who owns something | Synonyms: owner |
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| precursor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: forerunner |
| (noun) a substance from which another substance is formed (especially by a metabolic reaction) | - |
| predecessor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, precursor |
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| (noun) one who precedes you in time (as in holding a position or office) | - |
| prednisolone | (noun) a glucocorticoid (trade names Pediapred or Prelone) used to treat inflammatory conditions | Synonyms: Pediapred, Prelone |
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| prednisone | (noun) a dehydrogenated analogue of cortisol (trade names Orasone or Deltasone or Liquid Pred or Meticorten); used as an anti-inflammatory drug in the treatment of arthritis and as an immunosuppressant | Synonyms: Deltasone, Liquid Pred, Meticorten, Orasone |
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| prehensor | (noun) the anterior pair of legs of a centipede that are modified to seize prey and inject venom from the toxicognaths | - |
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| preseason | (noun) a period prior to the beginning of the regular season which is devoted to training and preparation | - |
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| pressor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: vasoconstrictive, vasoconstrictor |
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| prison | (noun) a correctional institution where persons are confined while on trial or for punishment | Synonyms: prison house |
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| (noun) a prisonlike situation; a place of seeming confinement | Synonyms: prison house |
| prisonbreak | (noun) an escape from jail | Synonyms: break, breakout, gaolbreak, jailbreak, prison-breaking |
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| prisoner | (noun) a person who is confined; especially a prisoner of war | Synonyms: captive |
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| processor | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, mainframe |
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| (noun) a business engaged in processing agricultural products and preparing them for market | - |
| (noun) someone who processes things (foods or photographs or applicants etc.) | - |
| professor | (noun) someone who is a member of the faculty at a college or university | Synonyms: prof |
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| professorship | (noun) the position of professor | Synonyms: chair |
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| promisor | (noun) a person who makes a promise | Synonyms: promiser |
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| prosociality | (noun) The quality of being beneficial to all parties and consistent with community laws and mores. | - |
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| prosodion | (noun) religious music used in a procession | Synonyms: processional |
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| prosody | (noun) the study of poetic meter and the art of versification | Synonyms: metrics |
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| (noun) the patterns of stress and intonation in a language | Synonyms: inflection |
| (noun) (prosody) a system of versification | Synonyms: poetic rhythm, rhythmic pattern |
| prosopopoeia | (noun) representing an abstract quality or idea as a person or creature | Synonyms: personification |
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| proteosome | (noun) a form of vaccine that can be administered by an inhaler | Synonyms: proteosome vaccine |
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| proviso | (noun) a stipulated condition | Synonyms: provision |
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| psoas | (noun) either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh | - |
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| psocid | (noun) small winged insect living on the bark and leaves of trees and feeding on e.g. fungi and decaying plant matter | - |
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| psoriasis | (noun) a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences | - |
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| pycnodysostosis | (noun) a form of dwarfism accompanied by fragile bones and bad teeth | - |
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| quarrelsomeness | (noun) an inclination to be quarrelsome and contentious | Synonyms: contentiousness |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| ragsorter | (noun) a worker who sorts rags and old clothing for new uses (as in papermaking) | - |
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| ransom | (noun) the act of freeing from captivity or punishment | - |
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| (noun) payment for the release of someone | - |
| (noun) money demanded for the return of a captured person | Synonyms: ransom money |
| ransomware | (noun) malicious software that makes a computer unusable unless a payment is made to the attacker | - |
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| reabsorption | (noun) the organic process in which the substance of some differentiated structure that has been produced by the body undergoes lysis and assimilation | Synonyms: resorption |
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| reason | (noun) the capacity for rational thought or inference or discrimination | Synonyms: intellect, understanding |
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| (noun) a fact that logically justifies some premise or conclusion | - |
| (noun) a justification for something existing or happening | Synonyms: cause, grounds |
| (noun) an explanation of the cause of some phenomenon | - |
| (noun) a rational motive for a belief or action | Synonyms: ground, occasion |
| (noun) the state of having good sense and sound judgment | Synonyms: rationality, reasonableness |
| reasonableness | (noun) goodness of reason and judgment | - |
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| (noun) moderation in expectations | - |
| (noun) the property of being moderate in price or expenditures | Synonyms: moderateness, modestness |
| (noun) the quality of being plausible or acceptable to a reasonable person | Synonyms: tenability, tenableness |
| (noun) the state of having good sense and sound judgment | Synonyms: rationality, reason |
| reasoner | (noun) someone who reasons logically | Synonyms: ratiocinator |
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| reasoning | (noun) thinking that is coherent and logical | Synonyms: abstract thought, logical thinking |
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| regosol | (noun) a type of soil consisting of unconsolidated material from freshly deposited alluvium or sand | - |
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| repressor | (noun) an agent that represses | Synonyms: represser |
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| repulsor | (noun) a fictional anti-gravity device in the Star Wars Universe. | Synonyms: repulsorlift, repulsorlift engine |
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| (noun) A repulsor is either one of two drives located in the gauntlets of Iron Man's armor; they have been referred to as being magnetic, a blast of charged particles, and as a force beam. | - |
| repulsorlift | (noun) a fictional anti-gravity device in the Star Wars Universe. | Synonyms: repulsor, repulsorlift engine |
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| resoluteness | (noun) the trait of being resolute | Synonyms: firmness, firmness of purpose, resolution, resolve |
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| resolution | (noun) a decision to do something or to behave in a certain manner | - |
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| (noun) finding a solution to a problem | Synonyms: solving |
| (noun) the trait of being resolute | Synonyms: firmness, firmness of purpose, resoluteness, resolve |
| (noun) analysis into clear-cut components | Synonyms: resolving |
| (noun) something settled or resolved; the outcome of decision making | Synonyms: closure, settlement |
| (noun) a statement that solves a problem or explains how to solve the problem | Synonyms: answer, result, solution, solvent |
| (noun) a formal expression by a meeting; agreed to by a vote | Synonyms: declaration, resolve |
| (noun) (music) a dissonant chord is followed by a consonant chord | - |
| (noun) the subsidence of swelling or other signs of inflammation (especially in a lung) | - |
| (noun) the ability of a microscope or telescope to measure the angular separation of images that are close together | Synonyms: resolving power |
| (noun) (computer science) the number of pixels per square inch on a computer-generated display; the greater the resolution, the better the picture | - |
| resolve | (noun) the trait of being resolute | Synonyms: firmness, firmness of purpose, resoluteness, resolution |
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| (noun) a formal expression by a meeting; agreed to by a vote | Synonyms: declaration, resolution |
| resolvent | (noun) a liquid substance capable of dissolving other substances | Synonyms: dissolvent, dissolver, dissolving agent, solvent |
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| resolving | (noun) analysis into clear-cut components | Synonyms: resolution |
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| resonance | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: plangency, reverberance, ringing, sonority, sonorousness, vibrancy |
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| (noun) the quality imparted to voiced speech sounds by the action of the resonating chambers of the throat and mouth and nasal cavities | - |
| (noun) a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system | - |
| (noun) an excited state of a stable particle causing a sharp maximum in the probability of absorption of electromagnetic radiation | - |
| (noun) a relationship of mutual understanding or trust and agreement between people | Synonyms: rapport |
| resonator | (noun) any system that resonates | - |
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| (noun) an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude | Synonyms: resonant circuit |
| (noun) a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves | Synonyms: cavity resonator, resonating chamber |
| resorcinol | (noun) a crystalline phenol obtained from various resins; used in ointments for acne and in dandruff shampoos | - |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| resorption | (noun) the organic process in which the substance of some differentiated structure that has been produced by the body undergoes lysis and assimilation | Synonyms: reabsorption |
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| resort | (noun) act of turning to for assistance | Synonyms: recourse, refuge |
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| (noun) something or someone turned to for assistance or security | Synonyms: recourse, refuge |
| (noun) a hotel located in a resort area | Synonyms: holiday resort, resort hotel |
| (noun) a frequently visited place | Synonyms: hangout, haunt, repair, stamping ground |
| resource | (noun) a source of aid or support that may be drawn upon when needed | - |
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| (noun) the ability to deal resourcefully with unusual problems | Synonyms: imagination, resourcefulness |
| (noun) available source of wealth; a new or reserve supply that can be drawn upon when needed | - |
| resourcefulness | (noun) the quality of being able to cope with a difficult situation | - |
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| (noun) the ability to deal resourcefully with unusual problems | Synonyms: imagination, resource |
| rhapsody | (noun) (in ancient Greece) an epic poem adapted for recitation | - |
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| (noun) (music) a free instrumental composition in one extended movement; typically emotional or exuberant in character | - |
| (noun) an enthusiastic expression of emotion | - |
| ribosome | (noun) an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell | - |
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| risotto | (noun) rice cooked with broth and sprinkled with grated cheese | Synonyms: Italian rice |
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| rissole | (noun) minced cooked meat or fish coated in egg and breadcrumbs and fried in deep fat | - |
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| sadomasochism | (noun) sadism and masochism combined in one person | - |
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