| abrogation | (noun) the act of abrogating; an official or legal cancellation | Synonyms: annulment, repeal |
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| abrogator | (noun) an authority or official empowered to abolish or annul or repeal | - |
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| acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
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| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
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| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| androgyne | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: epicene, epicene person, gynandromorph, hermaphrodite, intersex |
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| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
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| arrogance | (noun) overbearing pride evidenced by a superior manner toward inferiors | Synonyms: haughtiness, hauteur, high-handedness, lordliness |
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| arrogation | (noun) seizure by the government | Synonyms: confiscation |
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| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| arthrogram | (noun) an X ray of a joint after the injection of a contrast medium | - |
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| arthrography | (noun) roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram | - |
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| astrogator | (noun) the navigator of a spacecraft | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| barograph | (noun) a recording barometer; automatically records on paper the variations in atmospheric pressure | - |
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| brogan | (noun) a thick and heavy shoe | Synonyms: brogue, clodhopper, work shoe |
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| brogue | (noun) a thick and heavy shoe | Synonyms: brogan, clodhopper, work shoe |
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| bullfrog | (noun) largest North American frog; highly aquatic with a deep-pitched voice | Synonyms: Rana catesbeiana |
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| cerography | (noun) the art of engraving on a waxed plate on which a printing surface is created by electrotyping. | - |
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| chirography | (noun) beautiful handwriting | Synonyms: calligraphy, penmanship |
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| derogation | (noun) (law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law | - |
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| (noun) a communication that belittles somebody or something | Synonyms: depreciation, disparagement |
| dextroglucose | (noun) an isomer of glucose that is found in honey and sweet fruits | Synonyms: dextrose, grape sugar |
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| drogue | (noun) a parachute used to decelerate an object that is moving rapidly | Synonyms: drogue chute, drogue parachute |
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| (noun) restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind | Synonyms: sea anchor |
| (noun) a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind | Synonyms: air-sleeve, air sock, sock, wind cone, wind sleeve, wind sock, windsock |
| (noun) a funnel-shaped device towed as a target by an airplane | - |
| electrograph | (noun) electrical device used for etching by electrolytic means | - |
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| (noun) an apparatus for the electrical transmission of pictures | - |
| estrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: oestrogen |
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| frog | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, batrachian, salientian, toad, toad frog |
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| (noun) a decorative loop of braid or cord | - |
| (noun) a person of French descent | Synonyms: Gaul |
| frogbit | (noun) European floating plant with roundish heart-shaped leaves and white flowers | Synonyms: frog's-bit, Hydrocharis morsus-ranae |
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| frogfish | (noun) fish having a frog-like mouth with a lure on the snout | - |
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| froghopper | (noun) a variety of spittlebug | - |
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| frogman | (noun) someone who works underwater | Synonyms: diver, underwater diver |
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| frogmouth | (noun) insectivorous bird of Australia and southeastern Asia having a wide frog-like mouth | - |
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| gastrogavage | (noun) feeding a nutrient solution into the stomach through a tube through a surgically created opening | - |
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| glycerogel | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogelatin |
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| glycerogelatin | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogel |
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| goitrogen | (noun) any substance (such as thiouracil) that induces the formation of a goiter | - |
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| grog | (noun) rum cut with water | - |
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| grogginess | (noun) marginal consciousness | Synonyms: semiconsciousness, stupefaction, stupor |
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| (noun) a groggy state resulting from weariness | - |
| (noun) a dazed and staggering state caused by alcohol | - |
| grogram | (noun) a coarse fabric of silk mixed with wool or mohair and often stiffened with gum | - |
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| heterogeneity | (noun) the quality of being diverse and not comparable in kind | Synonyms: heterogeneousness |
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| heterogeneousness | (noun) the quality of being diverse and not comparable in kind | Synonyms: heterogeneity |
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| heterogenesis | (noun) the alternation of two or more different forms in the life cycle of a plant or animal | Synonyms: alternation of generations, xenogenesis |
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| heterogloss | (noun) the locative boundary of a certain linguistic feature, such as the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. | Synonyms: isogloss |
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| heterograft | (noun) tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species | Synonyms: xenograft |
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| hieroglyph | (noun) a writing system using picture symbols; used in ancient Egypt | Synonyms: hieroglyphic |
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| (noun) writing that resembles hieroglyphics (usually by being illegible) | Synonyms: hieroglyphic |
| hieroglyphic | (noun) a writing system using picture symbols; used in ancient Egypt | Synonyms: hieroglyph |
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| (noun) writing that resembles hieroglyphics (usually by being illegible) | Synonyms: hieroglyph |
| hydrogel | (noun) a colloidal gel in which water is the dispersion medium | - |
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| hydrogen | (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe | Synonyms: atomic number 1, H |
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| hydrogenation | (noun) a chemical process that adds hydrogen atoms to an unsaturated oil | - |
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| hydrography | (noun) the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation | - |
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| imbroglio | (noun) a very embarrassing misunderstanding | - |
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| (noun) an intricate and confusing interpersonal or political situation | Synonyms: embroilment |
| interrogation | (noun) formal systematic questioning | Synonyms: examination, interrogatory |
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| (noun) a sentence of inquiry that asks for a reply | Synonyms: interrogative, interrogative sentence, question |
| (noun) an instance of questioning | Synonyms: enquiry, inquiry, query, question |
| (noun) a transmission that will trigger an answering transmission from a transponder | - |
| interrogative | (noun) a sentence of inquiry that asks for a reply | Synonyms: interrogation, interrogative sentence, question |
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| (noun) some linguists consider interrogative sentences to constitute a mood | Synonyms: interrogative mood |
| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
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| interrogatory | (noun) formal systematic questioning | Synonyms: examination, interrogation |
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| leapfrog | (noun) a game in which one child bends down and another leaps over | - |
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| (noun) advancing as if in the child's game, by leaping over obstacles or competitors | - |
| macroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: astroglia |
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| macroglossia | (noun) a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome | - |
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| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| microgametophyte | (noun) the male gametophyte produced by a microspore | - |
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| microgauss | (noun) a unit of magnetic flux density equal to one millionth of a gauss | - |
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| microglia | (noun) neuroglial tissue of mesodermal origin that can become phagocytic | - |
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| microgliacyte | (noun) a cell of the microglia that may become phagocytic and collect waste products of nerve tissue | - |
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| microgram | (noun) one millionth (1/1,000,000) gram | Synonyms: mcg |
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| micrograph | (noun) a graphic reproduction (as a photograph) of the image of an object formed by a microscope. | - |
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| multiprogramming | (noun) the execution of two or more computer programs by a single computer | Synonyms: concurrent execution |
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| neurogenesis | (noun) the development of nerve tissues | - |
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| neuroglia | (noun) sustentacular tissue that surrounds and supports neurons in the central nervous system; glial and neural cells together compose the tissue of the central nervous system | Synonyms: glia |
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| neurogliacyte | (noun) a cell of the neuroglia | Synonyms: glial cell, neuroglial cell |
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| nitrogen | (noun) a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues | Synonyms: atomic number 7, N |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| nitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerine, Nitrospan, Nitrostat, trinitroglycerin |
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| nitroglycerine | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, Nitrospan, Nitrostat, trinitroglycerin |
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| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| oligodendroglia | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendria |
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| orogeny | (noun) the process of mountain formation (especially by the upward displacement of the earth's crust) | - |
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| orograph | (noun) A machine for use in making topographical maps. | - |
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| orography | (noun) the science of mountains | Synonyms: orology |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| phanerogam | (noun) plant that reproduces by means of seeds not spores | Synonyms: seed plant, spermatophyte |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| pirogi | (noun) small fruit or meat turnover baked or fried | Synonyms: piroshki, pirozhki |
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| pirogue | (noun) a canoe made by hollowing out and shaping a large log | Synonyms: dugout, dugout canoe |
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| polarography | (noun) an electrochemical method of chemical analysis | - |
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| prerogative | (noun) a right reserved exclusively by a particular person or group (especially a hereditary or official right) | Synonyms: exclusive right, perquisite, privilege |
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| progenitor | (noun) an ancestor in the direct line | Synonyms: primogenitor |
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| progeny | (noun) the immediate descendants of a person | Synonyms: issue, offspring |
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| progeria | (noun) a rare abnormality marked by premature aging (grey hair and wrinkled skin and stooped posture) in a child | - |
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| progesterone | (noun) a steroid hormone (trade name Lipo-Lutin) produced in the ovary; prepares and maintains the uterus for pregnancy | Synonyms: Lipo-Lutin |
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| progestin | (noun) any of a group of steroid hormones that have the effect of progesterone | Synonyms: progestogen |
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| progestogen | (noun) any of a group of steroid hormones that have the effect of progesterone | Synonyms: progestin |
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| prognathism | (noun) the condition of being prognathous; the condition of having a projecting jaw | - |
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| prognosis | (noun) a prediction of the course of a disease | Synonyms: medical prognosis, prospect |
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| (noun) a prediction about how something (as the weather) will develop | Synonyms: forecast |
| prognostic | (noun) a sign of something about to happen | Synonyms: omen, portent, presage, prodigy, prognostication |
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| prognostication | (noun) knowledge of the future (usually said to be obtained from a divine source) | Synonyms: prophecy, vaticination |
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| (noun) a statement made about the future | Synonyms: forecasting, foretelling, prediction |
| (noun) a sign of something about to happen | Synonyms: omen, portent, presage, prodigy, prognostic |