| protohistory | (noun) the study of humans prior to the invention of writing | Synonyms: protoanthropology |
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| protology | (noun) the study of origins and first things | - |
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| protomammal | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: therapsid |
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| proton | (noun) a stable particle with positive charge equal to the negative charge of an electron | - |
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| protoplasm | (noun) the substance of a living cell (including cytoplasm and nucleus) | Synonyms: living substance |
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| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| prototypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypic, prototypical |
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| prototype | (noun) a standard or typical example | Synonyms: epitome, image, paradigm |
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| prototypic | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypal, prototypical |
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| prototypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypal, prototypic |
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| protozoal | (adjective) of or relating to the Protozoa | Synonyms: protozoan, protozoic |
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| protozoan | (adjective) of or relating to the Protozoa | Synonyms: protozoal, protozoic |
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| (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoon |
| protozoic | (adjective) of or relating to the Protozoa | Synonyms: protozoal, protozoan |
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| protozoological | (adjective) concerning the branch of zoology that studies protozoans | - |
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| protozoologist | (noun) a zoologist who studies protozoans | - |
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| protozoology | (noun) the branch of zoology that studies protozoans | - |
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| protozoon | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoan |
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| protract | (verb) lengthen in time; cause to be or last longer | Synonyms: draw out, extend, prolong |
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| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| protractedly | (adverb) in a slow, leisurely or prolonged way | Synonyms: lingeringly |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| protriptyline | (noun) tricyclic antidepressant used to treat clinical depression | - |
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| protrude | (verb) swell or protrude outwards | Synonyms: bulge, pouch |
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| (verb) bulge outward | Synonyms: bug out, bulge, bulge out, come out, pop, pop out, start |
| (verb) extend out or project in space | Synonyms: jut, jut out, project, stick out |
| protruding | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, projecting, relieved, sticking, sticking out |
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| protrusible | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusile |
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| protrusile | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusible |
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| protrusion | (noun) the act of projecting out from something | Synonyms: jut, jutting, projection |
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| (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protuberance, swelling |
| protrusive | (adjective) thrusting outward | - |
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| protuberance | (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, swelling |
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| (noun) the condition of being protuberant; the condition of bulging out | - |
| protuberant | (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulging, bulgy |
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| protuberate | (verb) form a rounded prominence | - |
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| (verb) cause to bulge out or project | - |
| proturan | (noun) any of several minute primitive wingless and eyeless insects having a cone-shaped head; inhabit damp soil or decaying organic matter | Synonyms: telsontail |
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| psychoneurotic | (adjective) affected with emotional disorder | Synonyms: neurotic |
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| (noun) a person suffering from neurosis | Synonyms: mental case, neurotic |
| pyrotechnic | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnical |
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| (adjective) suggestive of fireworks | - |
| (noun) (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc. | Synonyms: firework |
| pyrotechnical | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnic |
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| pyrotechnics | (noun) the craft of making fireworks | Synonyms: pyrotechny |
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| (noun) (music) brilliance of display (as in the performance of music) | - |
| pyrotechny | (noun) the craft of making fireworks | Synonyms: pyrotechnics |
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| radioprotection | (noun) protection against harmful effects of radiation | - |
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| rot | (noun) unacceptable behavior (especially ludicrously false statements) | Synonyms: buncombe, bunk, bunkum, guff, hogwash |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: putrefaction |
| (verb) become physically weaker | Synonyms: waste |
| (verb) break down | Synonyms: decompose, molder, moulder |
| rota | (noun) a roster of names showing the order in which people should perform certain duties | - |
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| rotary | (adjective) relating to or characterized by rotation | - |
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| (adjective) describing a circle; moving in a circle | Synonyms: circular, orbitual |
| (noun) a road junction at which traffic streams circularly around a central island | Synonyms: circle, roundabout, traffic circle |
| (noun) electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa | Synonyms: rotary converter, synchronous converter |
| rotatable | (adjective) capable of being rotated | - |
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| rotate | (verb) plant or grow in a fixed cyclic order of succession | - |
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| (verb) perform a job or duty on a rotating basis | - |
| (verb) cause to turn on an axis or center | Synonyms: circumvolve |
| (verb) turn on or around an axis or a center | Synonyms: go around, revolve |
| (verb) turn outward | Synonyms: splay, spread out, turn out |
| (verb) exchange on a regular basis | - |
| rotated | (adjective) turned in a circle around an axis | Synonyms: revolved |
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| rotation | (noun) the act of rotating as if on an axis | Synonyms: rotary motion |
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| (noun) a planned recurrent sequence (of crops or personnel etc.) | - |
| (noun) a single complete turn (axial or orbital) | Synonyms: gyration, revolution |
| (noun) (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin | - |
| rotational | (adjective) of or pertaining to rotation | - |
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| rotationally | (adverb) in a rotational manner | - |
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| rotatory | (adjective) of or relating to or characteristic or causing an axial or orbital turn | Synonyms: revolutionary |
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| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| rote | (noun) memorization by repetition | Synonyms: rote learning |
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| rotenone | (noun) a white crystalline insecticide that has low toxicity for mammals; is used in home gardens; extracted from the roots of derris and cube | - |
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| rotgut | (noun) any alcoholic beverage of inferior quality | - |
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| rotifer | (noun) minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton | - |
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| rotisserie | (noun) a restaurant that specializes in roasted and barbecued meats | - |
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| (noun) an oven or broiler equipped with a rotating spit on which meat cooks as it turns | - |
| rotl | (noun) a unit of weight used in some Muslim countries near the Mediterranean; varies between one and five pounds | - |
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| rotogravure | (noun) using photography to produce a plate for printing | Synonyms: photogravure |
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| (noun) printing by transferring an image from a photogravure plate to a cylinder in a rotary press | - |
| (noun) printed material (text and pictures) produced by an intaglio printing process in a rotary press | - |
| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
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| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |
| rotted | (adjective) damaged by decay; hence unsound and useless | Synonyms: decayed, rotten |
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| rotten | (adjective) having decayed or disintegrated; usually implies foulness | - |
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| (adjective) damaged by decay; hence unsound and useless | Synonyms: decayed, rotted |
| (adjective) very bad | Synonyms: crappy, icky, lousy, shitty, stinking, stinky |
| rottenly | (adverb) in a terrible manner | Synonyms: abominably, abysmally, atrociously, awfully, terribly |
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| rottenness | (noun) the quality of rotting and becoming putrid | Synonyms: putrescence |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, putridness |
| rottenstone | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: tripoli |
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| rotter | (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, crumb, dirty dog, git, lowlife, puke, rat, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
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| rotting | (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rot |
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| rotund | (adjective) excessively fat | Synonyms: corpulent, obese, weighty |
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| (adjective) (of sounds) full and rich | Synonyms: orotund, pear-shaped, round |
| (adjective) spherical in shape | - |
| rotunda | (noun) a large circular room | - |
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| (noun) a building having a circular plan and a dome | - |
| rotundity | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundness, sphericalness, sphericity |
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| (noun) the fullness of a tone of voice | Synonyms: roundness |
| rotundly | (adverb) in a sonorous manner | Synonyms: sonorously |
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| rotundness | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundity, sphericalness, sphericity |
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| scleroprotein | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: albuminoid |
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| sclerotic | (adjective) of or relating to the sclera of the eyeball | - |
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| (adjective) relating to or having sclerosis; hardened | Synonyms: sclerosed |
| sclerotinia | (noun) any fungus of the genus Sclerotinia; some causing brown rot diseases in plants | - |
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| sclerotium | (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth | - |
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| sclerotomy | (noun) surgical incision of the sclerotic coat of the eye | - |
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| scrotal | (adjective) relating to or having or lying within a scrotum | - |
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| scrotum | (noun) the external pouch that contains the testes | - |
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| serotine | (noun) common brown bat of Europe | Synonyms: Eptesicus serotinus, European brown bat |
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| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
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| sporotrichosis | (noun) a chronic fungal infection of the skin and lymph nodes | - |
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| stepbrother | (noun) a brother who has only one parent in common with you | Synonyms: half-brother, half brother |
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| synchrotron | (noun) cyclotron in which the electric field is maintained at a constant frequency | - |
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| tarot | (noun) any of a set of (usually 78) cards that include 22 cards representing virtues and vices and death and fortune etc.; used for playing card games and for divination by fortunetellers | Synonyms: tarot card |
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| throttle | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: accelerator, throttle valve |
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| (noun) a pedal that controls the throttle valve | Synonyms: accelerator, accelerator pedal, gas, gas pedal, gun |
| (verb) reduce the air supply | Synonyms: choke |
| (verb) place limits on (extent or amount or access) | Synonyms: bound, confine, limit, restrict, trammel |
| (verb) kill by squeezing the throat of so as to cut off the air | Synonyms: strangle, strangulate |
| throttlehold | (noun) complete power over a person or situation | Synonyms: chokehold, stranglehold |
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| throttler | (noun) someone who kills by strangling | Synonyms: choker, garroter, garrotter, strangler |
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| throttling | (noun) the act of suffocating (someone) by constricting the windpipe | Synonyms: choking, strangling, strangulation |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxic | (adjective) of or relating to or affected by hyperthyroidism | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| tommyrot | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tosh, twaddle |
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| trinitrotoluene | (noun) explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene | Synonyms: TNT |
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| trot | (noun) a slow pace of running | Synonyms: jog, lope |
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| (noun) a gait faster than a walk; diagonally opposite legs strike the ground together | - |
| (noun) a literal translation used in studying a foreign language (often used illicitly) | Synonyms: crib, pony |
| (verb) run at a moderately swift pace | Synonyms: clip, jog |
| (verb) ride at a trot | - |
| (verb) cause to trot | - |
| troth | (noun) a solemn pledge of fidelity | Synonyms: plight |
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| (noun) a mutual promise to marry | Synonyms: betrothal, engagement |
| trotline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: setline, spiller, trawl, trawl line |
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