| anomalops | (noun) fish having a luminous organ beneath eye; of warm waters of the western Pacific and Puerto Rico | Synonyms: flashlight fish |
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| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| biopsy | (noun) examination of tissues or liquids from the living body to determine the existence or cause of a disease | - |
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| calliopsis | (noun) North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis | Synonyms: Coreopsis tinctoria |
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| caryopsis | (noun) dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn | Synonyms: grain |
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| ceratopsian | (noun) any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia | Synonyms: horned dinosaur |
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| chopsteak | (noun) a patty of ground cooked beef | Synonyms: beef patty, chop steak, chopped steak, hamburger steak |
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| chopstick | (noun) one of a pair of slender sticks used as oriental tableware to eat food with | - |
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| copse | (noun) a dense growth of bushes | Synonyms: brush, brushwood, coppice, thicket |
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| coreopsis | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: tick-weed, tickseed, tickweed |
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| cyclops | (noun) minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms | Synonyms: water flea |
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| dichromatopsia | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatism, dichromia |
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| dropseed | (noun) a grass of the genus Sporobolus | Synonyms: drop-seed |
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| dropsy | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: edema, hydrops, oedema |
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| endopsammon | (noun) The microscopic fauna of sand and mud. | - |
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| fasciolopsiasis | (noun) infestation with the large intestinal fluke Fasciolopsis buski; common in eastern Asia | - |
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| heliopsis | (noun) any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers | Synonyms: oxeye |
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| hemianopsia | (noun) blindness in one half of the visual field of one or both eyes | Synonyms: hemianopia |
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| hoops | (noun) a game played on a court by two opposing teams of 5 players; points are scored by throwing the ball through an elevated horizontal hoop | Synonyms: basketball, basketball game |
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| hoopskirt | (noun) a skirt stiffened with hoops | Synonyms: crinoline |
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| hops | (noun) twining perennials having cordate leaves and flowers arranged in conelike spikes; the dried flowers of this plant are used in brewing to add the characteristic bitter taste to beer | Synonyms: hop |
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| hopsack | (noun) a loosely woven coarse fabric of cotton or linen; used in clothing | Synonyms: hopsacking |
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| hopsacking | (noun) a loosely woven coarse fabric of cotton or linen; used in clothing | Synonyms: hopsack |
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| hopscotch | (noun) a game in which a child tosses a stone into an area drawn on the ground and then hops through it and back to regain the stone | - |
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| hydrops | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: dropsy, edema, oedema |
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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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| liliopsid | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, monocot, monocotyledon |
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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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| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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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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| 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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| 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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| 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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| paratroops | (noun) infantry trained and equipped to parachute | - |
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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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| props | (noun) proper respect | - |
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| protoceratops | (noun) small horned dinosaur | - |
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| rhodopsin | (noun) a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light | Synonyms: retinal purple, visual purple |
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| rollmops | (noun) a pickled herring filet that has been rolled or wrapped around a pickle | - |
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| slops | (noun) cheap clothing (as formerly issued to sailors in Britain) | - |
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| (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, pigwash, slop, swill |
| slopseller | (noun) a dealer in cheap ready-made clothing | Synonyms: slop-seller |
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| slopshop | (noun) a store that sells cheap ready-made clothing | Synonyms: slopseller's shop |
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| sops | (noun) piece of solid food for dipping in a liquid | Synonyms: sop |
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| stops | (noun) a gambling card game in which chips are placed on the ace and king and queen and jack of separate suits (taken from a separate deck); a player plays the lowest card of a suit in his hand and successively higher cards are played until the sequence stops; the player who plays a card matching one in the layout wins all the chips on that card | Synonyms: boodle, Chicago, Michigan, Newmarket |
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| sundrops | (noun) a day-flowering biennial or perennial of the genus Oenothera | Synonyms: Oenothera fruticosa |
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| synopsis | (noun) a sketchy summary of the main points of an argument or theory | Synonyms: abstract, outline, precis |
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| thanatopsis | (noun) an essay expressing a view on the subject of death | - |
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| topsail | (noun) a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast | - |
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| topside | (noun) (usually plural) weather deck; the part of a ship's hull that is above the waterline | - |
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| topsoil | (noun) the layer of soil on the surface | Synonyms: surface soil |
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| topspin | (noun) forward spin (usually of a moving ball) that is imparted by an upward stroke | - |
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| triceratops | (noun) huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill | - |
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| troops | (noun) soldiers collectively | Synonyms: military personnel, soldiery |
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| troopship | (noun) ship for transporting troops | - |
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| xanthopsia | (noun) visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice | - |
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| zoopsia | (noun) visual hallucination of animals; sometimes occurring in delirium tremens | - |
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