| newscaster | (noun) someone who broadcasts the news | - |
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| nondescript | (noun) a person who is not easily classified and not very interesting | - |
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| obfuscation | (noun) the activity of obscuring people's understanding, leaving them baffled or bewildered | Synonyms: mystification |
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| (noun) darkening or obscuring the sight of something | - |
| (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bemusement, bewilderment, mystification, puzzlement |
| obscenity | (noun) an obscene act | - |
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| (noun) the trait of behaving in an obscene manner | Synonyms: bawdiness, lewdness, salaciousness, salacity |
| (noun) an offensive or indecent word or phrase | Synonyms: dirty word, filth, smut, vulgarism |
| obscurantism | (noun) a deliberate act intended to make something obscure | - |
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| (noun) a policy of opposition to enlightenment or the spread of knowledge | - |
| obscurantist | (noun) a person who is deliberately vague | - |
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| obscureness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscurity, reconditeness |
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| (noun) the state of being humble and unimportant | Synonyms: humbleness, lowliness, unimportance |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscurity |
| obscurity | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscureness, reconditeness |
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| (noun) an obscure and unimportant standing; not well known | - |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscureness |
| obsolescence | (noun) the process of becoming obsolete; falling into disuse or becoming out of date | - |
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| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
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| omniscience | (noun) the state of being omniscient; having infinite knowledge | - |
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| opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| orthoscope | (noun) an ophthalmoscope with a layer of water to neutralize the refraction of the cornea | - |
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| oscheocele | (noun) swelling of the scrotum | Synonyms: oscheocoele |
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| oscheocoele | (noun) swelling of the scrotum | Synonyms: oscheocele |
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| oscillation | (noun) (physics) a regular periodic variation in value about a mean | Synonyms: vibration |
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| (noun) a single complete execution of a periodically repeated phenomenon | Synonyms: cycle |
| (noun) the process of oscillating between states | - |
| oscillator | (noun) generator that produces sonic oscillations or alternating current | - |
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| oscillogram | (noun) the recording produced by an oscillograph | - |
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| oscillograph | (noun) a device for making a record of the wave forms of fluctuating voltages or currents | - |
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| oscilloscope | (noun) electronic equipment that provides visual images of varying electrical quantities | Synonyms: cathode-ray oscilloscope, CRO, scope |
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| oscine | (noun) passerine bird having specialized vocal apparatus | Synonyms: oscine bird |
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| oscitance | (noun) an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom | Synonyms: oscitancy, yawn, yawning |
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| (noun) drowsiness and dullness manifested by yawning | Synonyms: oscitancy |
| oscitancy | (noun) an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom | Synonyms: oscitance, yawn, yawning |
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| (noun) drowsiness and dullness manifested by yawning | Synonyms: oscitance |
| osculation | (noun) the act of caressing with the lips (or an instance thereof) | Synonyms: buss, kiss |
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| (noun) (mathematics) a contact of two curves (or two surfaces) at which they have a common tangent | - |
| osculator | (noun) someone who kisses | Synonyms: kisser |
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| osteosclerosis | (noun) abnormal hardening or eburnation of bone | - |
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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| otoscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, auroscope |
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| pascal | (noun) a unit of pressure equal to one newton per square meter | Synonyms: Pa |
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| periscope | (noun) an optical instrument that provides a view of an otherwise obstructed field | - |
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| phosphorescence | (noun) a fluorescence that persists after the bombarding radiation has ceased | - |
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| pinscher | (noun) any of three breeds of dogs whose ears and tail are usually cropped | - |
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| piscary | (noun) a workplace where fish are caught and processed and sold | Synonyms: fishery |
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| playschool | (noun) a small informal nursery group meeting for half-day sessions | Synonyms: play group |
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| playscript | (noun) a written version of a play or other dramatic composition; used in preparing for a performance | Synonyms: book, script |
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| plebiscite | (noun) a vote by the electorate determining public opinion on a question of national importance | - |
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| polariscope | (noun) an optical device used to measure the rotation of the plane of vibration of polarized light | Synonyms: polarimeter |
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| postscript | (noun) a note appended to a letter after the signature | Synonyms: PS |
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| (noun) textual matter that is added onto a publication; usually at the end | Synonyms: addendum, supplement |
| preschool | (noun) an educational institution for children too young for elementary school | - |
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| preschooler | (noun) a child who attends a preschool or kindergarten | Synonyms: kindergartener, kindergartner |
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| prescience | (noun) the power to foresee the future | Synonyms: prevision |
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| prescript | (noun) prescribed guide for conduct or action | Synonyms: rule |
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| prescription | (noun) a drug that is available only with written instructions from a doctor or dentist to a pharmacist | Synonyms: ethical drug, prescription drug, prescription medicine |
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| (noun) directions prescribed beforehand; the action of prescribing authoritative rules or directions | - |
| (noun) written instructions from a physician or dentist to a druggist concerning the form and dosage of a drug to be issued to a given patient | - |
| (noun) written instructions for an optician on the lenses for a given person | - |
| prescriptivism | (noun) (linguistics) a doctrine supporting or promoting prescriptive linguistics | - |
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| (noun) (ethics) a doctrine holding that moral statements prescribe appropriate attitudes and behavior | - |
| proboscidean | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidian |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| proboscis | (noun) a long flexible snout as of an elephant | Synonyms: trunk |
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| (noun) the human nose (especially when it is large) | - |
| proctoscope | (noun) an endoscope for examining the rectum | - |
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| proctoscopy | (noun) visual examination of the rectum and the end of the colon by means of a proctoscope | - |
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| promiscuity | (noun) indulging in promiscuous (casual and indiscriminate) sexual relations | Synonyms: promiscuousness, sleeping around |
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| promiscuousness | (noun) indulging in promiscuous (casual and indiscriminate) sexual relations | Synonyms: promiscuity, sleeping around |
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| proscenium | (noun) the wall that separates the stage from the auditorium in a modern theater | Synonyms: proscenium wall |
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| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: apron, forestage |
| prosciutto | (noun) Italian salt-cured ham usually sliced paper thin | - |
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| proscription | (noun) rejection by means of an act of banishing or proscribing someone | Synonyms: banishment |
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| (noun) a decree that prohibits something | Synonyms: ban, prohibition |
| 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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| pubescence | (noun) the time of life when sex glands become functional | Synonyms: puberty |
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| putrescence | (noun) the quality of rotting and becoming putrid | Synonyms: rottenness |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putridness, rottenness |
| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| putsch | (noun) a sudden and decisive change of government illegally or by force | Synonyms: coup, coup d'etat, takeover |
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| pyroscope | (noun) a pyrometer that uses the color of the light emitted by a hot object | Synonyms: optical pyrometer |
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| quiescence | (noun) quiet and inactive restfulness | Synonyms: dormancy, quiescency, sleeping |
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| (noun) a state of quiet (but possibly temporary) inaction | Synonyms: dormancy, quiescency |
| quiescency | (noun) quiet and inactive restfulness | Synonyms: dormancy, quiescence, sleeping |
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| (noun) a state of quiet (but possibly temporary) inaction | Synonyms: dormancy, quiescence |
| rachischisis | (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis | Synonyms: schistorrhachis, spina bifida |
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| radioscopy | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radiology |
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| rapscallion | (noun) one who is playfully mischievous | Synonyms: imp, monkey, rascal, scalawag, scallywag, scamp |
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| (noun) a deceitful and unreliable scoundrel | Synonyms: knave, rascal, rogue, scalawag, scallywag, varlet |
| rascal | (noun) one who is playfully mischievous | Synonyms: imp, monkey, rapscallion, scalawag, scallywag, scamp |
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| (noun) a deceitful and unreliable scoundrel | Synonyms: knave, rapscallion, rogue, scalawag, scallywag, varlet |
| rascality | (noun) reckless or malicious behavior that causes discomfort or annoyance in others | Synonyms: devilment, devilry, deviltry, mischief-making, mischief, mischievousness, roguery, roguishness, shenanigan |
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| (noun) the trait of indulging in disreputable pranks | Synonyms: prankishness, roguishness |
| (noun) the quality of being a slippery rascal | Synonyms: shiftiness, slipperiness, trickiness |
| recrudescence | (noun) a return of something after a period of abatement | - |
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| rediscovery | (noun) the act of discovering again | - |
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| rejuvenescence | (noun) A renewal of youthful characteristics or vitality. | - |
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| reminiscence | (noun) the process of remembering (especially the process of recovering information by mental effort) | Synonyms: recall, recollection |
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| (noun) a mental impression retained and recalled from the past | - |
| renascence | (noun) a second or new birth | Synonyms: rebirth, reincarnation |
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| requiescat | (noun) a prayer for the repose of the soul of a dead person | - |
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| rescission | (noun) (law) the act of rescinding; the cancellation of a contract and the return of the parties to the positions they would have had if the contract had not been made | Synonyms: recission |
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| rescript | (noun) something that has been written again | Synonyms: revision, rewrite |
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| (noun) the act of rewriting something | Synonyms: revisal, revise, revision |
| (noun) a reply by a Pope to an inquiry concerning a point of law or morality | - |
| (noun) a legally binding command or decision entered on the court record (as if issued by a court or judge) | Synonyms: decree, edict, fiat, order |
| rescue | (noun) recovery or preservation from loss or danger | Synonyms: deliverance, delivery, saving |
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| rescuer | (noun) someone who saves something from danger or violence | Synonyms: recoverer, saver |
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| (noun) a person who rescues you from harm or danger | Synonyms: deliverer, savior, saviour |
| resuscitation | (noun) the act of reviving a person and returning them to consciousness | - |
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| resuscitator | (noun) a breathing apparatus used for resuscitation by forcing oxygen into the lungs of a person who has undergone asphyxia or arrest of respiration | - |
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| rhinoscope | (noun) medical instrument consisting of a mirror mounted at an angle on a rod; used to examine the nasal passages (through the nasopharynx) | - |
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| rhinoscopy | (noun) examination of the nasal passages (either through the anterior nares or with a rhinoscope through the nasopharynx) | - |
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| roentgenoscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: fluoroscope |
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| salesclerk | (noun) a salesperson in a store | Synonyms: clerk, shop assistant, shop clerk |
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| saurischian | (noun) herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile | Synonyms: saurischian dinosaur |
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| scab | (noun) the crustlike surface of a healing skin lesion | - |
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| (noun) someone who works (or provides workers) during a strike | Synonyms: blackleg, rat, strikebreaker |
| scabbard | (noun) a sheath for a sword or dagger or bayonet | - |
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| scabicide | (noun) a drug that destroys the itch mite that causes scabies | - |
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| scabies | (noun) a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation | Synonyms: itch |
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| scabiosa | (noun) any of various plants of the genus Scabiosa | Synonyms: scabious |
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| scabious | (noun) any of various plants of the genus Scabiosa | Synonyms: scabiosa |
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| scablands | (noun) (geology) flat elevated land with poor soil and little vegetation that is scarred by dry channels of glacial origin (especially in eastern Washington) | - |
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| scad | (noun) any of a number of fishes of the family Carangidae | - |
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| scads | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, oodles, piles, rafts, scores, slews, stacks, tons, wads |
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| scaffold | (noun) a temporary arrangement erected around a building for convenience of workers | - |
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| (noun) a platform from which criminals are executed (hanged or beheaded) | - |
| scaffolding | (noun) a system of scaffolds | Synonyms: staging |
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| scag | (noun) street names for heroin | Synonyms: big H, hell dust, nose drops, skag, smack, thunder |
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