| hysterocatalepsy | (noun) hysteria with cataleptic symptoms | - |
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| iodopsin | (noun) a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | - |
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| ipsedixitism | (noun) an unsupported dogmatic assertion | Synonyms: ipse dixit |
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| jumpstart | (noun) starting an automobile engine that has a weak battery by means of jumper cables to another car | Synonyms: jump-start |
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| jumpsuit | (noun) one-piece garment fashioned after a parachutist's uniform | Synonyms: jump suit |
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| keepsake | (noun) something of sentimental value | Synonyms: relic, souvenir, token |
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| knapsack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, haversack, packsack, rucksack |
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| lampshade | (noun) a protective ornamental covering for a lamp, used to screen a light bulb from direct view | Synonyms: lamp shade, shade |
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| lampshell | (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: brachiopod, lamp shell |
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| lapse | (noun) a mistake resulting from inattention | Synonyms: oversight |
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| (noun) a failure to maintain a higher state | Synonyms: backsliding, lapsing, relapse, relapsing, reversion, reverting |
| (noun) a break or intermission in the occurrence of something | - |
| lapsing | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, relapse, relapsing, reversion, reverting |
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| liliopsid | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, monocot, monocotyledon |
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| lipstick | (noun) makeup that is used to color the lips | Synonyms: lip rouge |
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| lithops | (noun) any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones | Synonyms: flowering stone, living stone, stone-face, stone life face, stone plant, stoneface |
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| lopsidedness | (noun) an oblique or slanting asymmetry | Synonyms: skewness |
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| lumpsucker | (noun) any of several very small lumpfishes | - |
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| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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| metalepsis | (noun) substituting metonymy of one figurative sense for another | - |
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| metamorphopsia | (noun) a defect of vision in which objects appear to be distorted; usually due to a defect in the retina | - |
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| metempsychosis | (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: rebirth |
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| monopsony | (noun) (economics) a market in which goods or services are offered by several sellers but there is only one buyer | - |
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| mumps | (noun) an acute contagious viral disease characterized by fever and by swelling of the parotid glands | Synonyms: epidemic parotitis |
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| mumpsimus | (noun) a traditional notion that is obstinately held although it is unreasonable | - |
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| narcolepsy | (noun) a sleep disorder characterized by sudden and uncontrollable episodes of deep sleep | - |
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| necropsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: autopsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| neuropsychiatry | (noun) the branch of medicine dealing with mental disorders attributable to diseases of the nervous system | - |
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| neuropsychology | (noun) the branch of psychology that is concerned with the physiological bases of psychological processes | Synonyms: physiological psychology, psychophysiology |
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| nympholepsy | (noun) a frenzy of emotion; as for something unattainable | - |
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| omphaloskepsis | (noun) literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption | Synonyms: navel-gazing |
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| opsin | (noun) retinal protein formed by the action of light on rhodopsin | - |
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| opsonin | (noun) an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes | - |
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| 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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| palimpsest | (noun) a manuscript (usually written on papyrus or parchment) on which more than one text has been written with the earlier writing incompletely erased and still visible | - |
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| paraleipsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paralepsis, paralipsis, preterition |
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| paralepsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paraleipsis, paralipsis, preterition |
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| paralipsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paraleipsis, paralepsis, preterition |
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| parapsychologist | (noun) someone who studies the evidence for such psychological phenomena as psychokinesis and telepathy and clairvoyance | - |
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| parapsychology | (noun) phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes | Synonyms: psychic phenomena, psychic phenomenon |
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| paratroops | (noun) infantry trained and equipped to parachute | - |
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| peepshow | (noun) a short pornographic film shown in a small coin-operated booth | - |
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| (noun) an exhibition of pictures or objects viewed through a small hole or magnifying glass | Synonyms: raree-show |
| pepsin | (noun) an enzyme produced in the stomach that splits proteins into peptones | - |
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| pepsinogen | (noun) precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach | - |
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| periapsis | (noun) (astronomy) the point in an orbit closest to the body being orbited | Synonyms: point of periapsis |
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| phillipsite | (noun) a group of white or reddish crystalline minerals of the zeolite family consisting of a hydrous silicate of calcium and potassium and aluminum | - |
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| pipsissewa | (noun) any of several plants of the genus Chimaphila | Synonyms: prince's pine |
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| polydipsia | (noun) excessive thirst (as in cases of diabetes or kidney dysfunction) | - |
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| popsicle | (noun) ice cream or water ice on a small wooden stick | Synonyms: ice lolly, lollipop, lolly |
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| preeclampsia | (noun) abnormal state of pregnancy characterized by hypertension and fluid retention and albuminuria; can lead to eclampsia if untreated | Synonyms: pre-eclampsia |
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| prolapse | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapsus |
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| prolapsus | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapse |
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| prolepsis | (noun) anticipating and answering objections in advance | - |
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| props | (noun) proper respect | - |
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| protoceratops | (noun) small horned dinosaur | - |
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| psalm | (noun) any sacred song used to praise the deity | - |
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| psalmist | (noun) a composer of sacred songs | - |
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| psalmody | (noun) the act of singing psalms or hymns | Synonyms: hymnody |
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| psalterium | (noun) the third compartment of the stomach of a ruminant | Synonyms: omasum, third stomach |
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| psaltery | (noun) an ancient stringed instrument similar to the lyre or zither but having a trapezoidal sounding board under the strings | - |
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| psammoma | (noun) a tumor derived from fibrous tissue of the meninges or choroid plexus or certain other structures associated with the brain; characterized by sandlike particles | Synonyms: sand tumor |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psephology | (noun) the branch of sociology that studies election trends (as by opinion polls) | - |
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| pseud | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseudo, role player, sham, shammer |
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| pseudo | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, role player, sham, shammer |
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| pseudobulb | (noun) a solid bulblike enlargement of the stem of some orchids | - |
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| pseudocarp | (noun) fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry | Synonyms: accessory fruit |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| pseudohermaphrodite | (noun) someone having external genitalia of one sex and internal sex organs of the other sex; not a true hermaphrodite because there is no ambiguity in the sex of the external genitalia and hence no question about gender at birth | - |
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| pseudohermaphroditism | (noun) congenital condition in which a person has external genitalia of one sex and internal sex organs of the other sex | - |
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| pseudomonad | (noun) bacteria usually producing greenish fluorescent water-soluble pigment; some pathogenic for plants and animals | - |
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| pseudonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: anonym, nom de guerre |
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| pseudophloem | (noun) false phloem | - |
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| pseudopod | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopodium |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| pseudorubella | (noun) a viral disease of infants and young children; characterized by abrupt high fever and mild sore throat; a few days later there is a faint pinkish rash that lasts for a few hours to a few days | Synonyms: exanthema subitum, roseola infantilis, roseola infantum |
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| pseudoscience | (noun) an activity resembling science but based on fallacious assumptions | - |
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| pseudoscorpion | (noun) small nonvenomous arachnid resembling a tailless scorpion | Synonyms: false scorpion |
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| pseudosmallpox | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| pseudovariola | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudosmallpox, variola minor, West Indian smallpox, white pox |
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| psi | (noun) the 23rd letter of the Greek alphabet | - |
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| (noun) a unit of pressure | Synonyms: pounds per square inch |
| psilocin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocybin |
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| (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocine, psilocyn, psilotsin |
| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| psilocybin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocin |
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| psilocyn | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilotsin |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| psilophyte | (noun) any plant of the order Psilophytales: a savannah plant | - |
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| psilophyton | (noun) any plant or fossil of the genus Psilophyton | - |
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| psilosis | (noun) falling out of hair | - |
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| (noun) a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation | Synonyms: sprue, tropical sprue |
| psilotsin | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilocyn |
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| psittacosaur | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaurus |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |
| 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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| psyche | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, mind, nous |
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| (noun) the immaterial part of a person; the actuating cause of an individual life | Synonyms: soul |
| psychedelia | (noun) the subculture of users of psychedelic drugs | - |
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| psychiatrist | (noun) a physician who specializes in psychiatry | Synonyms: head-shrinker, shrink |
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