| andradite | (noun) a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone | - |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| biradially | (adverb) in a biradial manner | - |
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| coloradillo | (noun) handsome shrub with showy orange to scarlet or crimson flowers; Florida and West Indies to Mexico and Brazil | Synonyms: Hamelia erecta, Hamelia patens, scarlet bush, scarlet hamelia |
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| contradict | (verb) prove negative; show to be false | Synonyms: negate |
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| (verb) deny the truth of | Synonyms: contravene, negate |
| (verb) be resistant to | Synonyms: controvert, oppose |
| (verb) be in contradiction with | Synonyms: belie, negate |
| contradiction | (noun) the speech act of contradicting someone | - |
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| (noun) (logic) a statement that is necessarily false | Synonyms: contradiction in terms |
| (noun) opposition between two conflicting forces or ideas | - |
| contradictorily | (adverb) in a contradictory manner | - |
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| contradictoriness | (noun) the relation that exists when opposites cannot coexist | - |
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| contradictory | (adjective) of words or propositions so related that both cannot be true and both cannot be false | - |
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| (adjective) unable for both to exist or be true at the same time | Synonyms: mutually exclusive |
| (adjective) in disagreement | Synonyms: at odds, conflicting, self-contradictory |
| (adjective) that confounds or contradicts or confuses | Synonyms: confounding |
| (noun) two propositions are contradictories if both cannot be true (or both cannot be false) at the same time | - |
| contradistinction | (noun) a distinction drawn on the basis of contrast | - |
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| contradistinguish | (verb) distinguish by contrasting qualities | - |
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| degrading | (adjective) used of conduct; characterized by dishonor | Synonyms: debasing |
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| (adjective) harmful to the mind or morals | Synonyms: corrupting |
| eradicable | (adjective) able to be eradicated or rooted out | - |
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| eradicate | (verb) kill in large numbers | Synonyms: annihilate, carry off, decimate, eliminate, extinguish, wipe out |
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| (verb) destroy completely, as if down to the roots | Synonyms: exterminate, extirpate, root out, uproot |
| eradication | (noun) the complete destruction of every trace of something | Synonyms: obliteration |
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| eradicator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: exterminator, terminator |
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| estradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: oestradiol |
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| extradite | (verb) hand over to the authorities of another country | Synonyms: deliver, deport |
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| extradition | (noun) the surrender of an accused or convicted person by one state or country to another (usually under the provisions of a statute or treaty) | - |
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| fradicin | (noun) an antibiotic obtained from an actinomycete and used (as a sulphate under the trade name Neobiotic) as an intestinal antiseptic in surgery | Synonyms: Neobiotic, neomycin |
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| gradient | (noun) the property possessed by a line or surface that departs from the horizontal | Synonyms: slope |
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| (noun) a graded change in the magnitude of some physical quantity or dimension | - |
| grading | (noun) the act of arranging in a graduated series | Synonyms: scaling |
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| (noun) evaluation of performance by assigning a grade or score | Synonyms: marking, scoring |
| (noun) changing the ground level to a smooth horizontal or gently sloping surface | Synonyms: leveling |
| horseradish | (noun) grated horseradish root | - |
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| (noun) coarse Eurasian plant cultivated for its thick white pungent root | Synonyms: Armoracia rusticana, horse radish, red cole |
| (noun) the root of the horseradish plant; it is grated or ground and used for seasoning | Synonyms: horseradish root |
| ineradicable | (adjective) not able to be destroyed or rooted out | - |
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| irradiate | (verb) expose to radiation | Synonyms: ray |
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| (verb) cast rays of light upon | - |
| (verb) give spiritual insight to; in religion | Synonyms: enlighten |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
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| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
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| nonradioactive | (adjective) not radioactive | - |
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| nontraditional | (adjective) not conforming to or in accord with tradition | Synonyms: untraditional |
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| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| paradiddle | (noun) the sound of a drum (especially a snare drum) beaten rapidly and continuously | Synonyms: drum roll, roll |
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| paradigm | (noun) a standard or typical example | Synonyms: epitome, image, prototype |
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| (noun) the generally accepted perspective of a particular discipline at a given time | - |
| (noun) the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another) | Synonyms: substitution class |
| (noun) systematic arrangement of all the inflected forms of a word | - |
| paradigmatic | (adjective) of or relating to a typical example | - |
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| (adjective) of or relating to a grammatical paradigm | - |
| (adjective) related as members of a substitution class | - |
| paradisaic | (adjective) relating to or befitting Paradise | Synonyms: paradisaical, paradisal, paradisiac, paradisiacal |
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| paradisaical | (adjective) relating to or befitting Paradise | Synonyms: paradisaic, paradisal, paradisiac, paradisiacal |
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| paradisal | (adjective) relating to or befitting Paradise | Synonyms: paradisaic, paradisaical, paradisiac, paradisiacal |
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| paradise | (noun) any place of complete bliss and delight and peace | Synonyms: Eden, heaven, nirvana, promised land, Shangri-la |
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| paradisiac | (adjective) relating to or befitting Paradise | Synonyms: paradisaic, paradisaical, paradisal, paradisiacal |
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| paradisiacal | (adjective) relating to or befitting Paradise | Synonyms: paradisaic, paradisaical, paradisal, paradisiac |
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| radial | (adjective) relating to or moving along or having the direction of a radius | - |
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| (adjective) relating to or near the radius | - |
| (adjective) issuing in rays from a common center; relating to rays of light | - |
| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radiate, stellate |
| (noun) pneumatic tire that has radial-ply casing | Synonyms: radial-ply tire, radial tire |
| radially | (adverb) in a radial manner | - |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiance | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiancy, refulgence, refulgency, shine |
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| (noun) the amount of electromagnetic radiation leaving or arriving at a point on a surface | Synonyms: glow, glowing |
| (noun) an attractive combination of good health and happiness | - |
| radiancy | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, refulgence, refulgency, shine |
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| radiant | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, refulgent |
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| radiantly | (adverb) in a radiant manner | - |
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| radiate | (adjective) having rays or ray-like parts as in the flower heads of daisies | - |
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| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radial, stellate |
| (verb) send out real or metaphoric rays; the children radiated joyous energy | - |
| (verb) issue or emerge in rays or waves | - |
| (verb) spread into new habitats and produce variety or variegate | Synonyms: diversify |
| (verb) experience a feeling of well-being or happiness, as from good health or an intense emotion | Synonyms: beam, glow, shine |
| (verb) cause to be seen by emitting light as if in rays | - |
| (verb) have a complexion with a strong bright color, such as red or pink | Synonyms: beam, glow, shine |
| (verb) extend or spread outward from a center or focus or inward towards a center | Synonyms: ray |
| (verb) send out rays or waves | - |
| radiating | (adjective) diverging from a common point | - |
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| radiation | (noun) the act of spreading outward from a central source | - |
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| (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation therapy, radiotherapy |
| (noun) a radial arrangement of nerve fibers connecting different parts of the brain | - |
| (noun) the spread of a group of organisms into new habitats | - |
| (noun) energy that is radiated or transmitted in the form of rays or waves or particles | - |
| (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radioactivity |
| (noun) syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours | Synonyms: radiation sickness, radiation syndrome |
| radiator | (noun) a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan | - |
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| (noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings | - |
| (noun) any object that radiates energy | - |
| radical | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: basal |
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| (adjective) of or relating to or constituting a linguistic root | - |
| (adjective) arising from or going to the root or source | - |
| (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, ultra |
| (adjective) markedly new or introducing radical change | Synonyms: revolutionary |
| (noun) a character conveying the lexical meaning of a logogram | - |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, root, root word, stem, theme |
| (noun) a person who has radical ideas or opinions | - |
| (noun) (mathematics) a quantity expressed as the root of another quantity | - |
| (noun) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule | Synonyms: chemical group, group |
| (noun) an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule | Synonyms: free radical |
| radicalism | (noun) the political orientation of those who favor revolutionary change in government and society | - |
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| radicalize | (verb) make more radical in social or political outlook | - |
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| radically | (adverb) in a radical manner | - |
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| radicchio | (noun) prized variety of chicory having globose heads of red leaves | - |
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| radicle | (noun) (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve) | - |
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| radiculitis | (noun) inflammation of the radicle of a nerve | - |
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| radio | (adjective) indicating radiation or radioactivity | - |
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| (noun) a communication system based on broadcasting electromagnetic waves | Synonyms: wireless |
| (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio receiver, radio set, receiving set, tuner, wireless |
| (noun) medium for communication | Synonyms: radiocommunication, wireless |
| (verb) transmit messages via radio waves | - |
| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radioactively | (adverb) in a radioactive manner | - |
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| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| radiocarbon | (noun) a radioactive isotope of carbon | Synonyms: carbon 14 |
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| radiochemist | (noun) a chemist who specializes in nuclear chemistry | Synonyms: nuclear chemist |
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| radiochemistry | (noun) the chemistry of radioactive substances | Synonyms: nuclear chemistry |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| radiocommunication | (noun) medium for communication | Synonyms: radio, wireless |
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| radiogram | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiograph, shadowgraph, skiagram, skiagraph |
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| (noun) a message transmitted by wireless telegraphy | - |
| radiograph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, shadowgraph, skiagram, skiagraph |
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| radiographer | (noun) a person who makes radiographs | - |
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| radiographic | (adjective) relating to or produced by radiography | - |
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| radiography | (noun) photography that uses other kinds of radiation than visible light | - |
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| (noun) the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light | Synonyms: skiagraphy |
| radioimmunoassay | (noun) immunoassay of a substance that has been radioactively labeled | - |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| radiolocate | (verb) locate by means of radar | - |
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| radiolocation | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radar, radio detection and ranging |
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| radiological | (adjective) of or relating to radiology | - |
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| radiologist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiotherapist |
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| radiology | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radioscopy |
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| (noun) the branch of medical science dealing with the medical use of X-rays or other penetrating radiation | - |
| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| radiolysis | (noun) molecular disintegration resulting from radiation | - |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| radiopacity | (noun) opacity to X-rays or other radiation | Synonyms: radio-opacity |
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| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| radiopharmaceutical | (noun) pharmaceutical consisting of a radioactive compound used in radiation therapy | - |
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| radiophone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiotelephone, wireless telephone |
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| radiophonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiotelephonic |
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| radiophoto | (noun) a photograph transmitted by radio waves | Synonyms: radiophotograph |
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| radiophotograph | (noun) a photograph transmitted by radio waves | Synonyms: radiophoto |
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| radiophotography | (noun) transmission of photographs by radio waves | - |
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| radioprotection | (noun) protection against harmful effects of radiation | - |
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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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