| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abducting | (adjective) especially of muscles; drawing away from the midline of the body or from an adjacent part | Synonyms: abducent |
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| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| actinoid | (adjective) having a radial form | - |
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| (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| actinon | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinoid |
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| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| adducting | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducent, adductive |
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| affecting | (adjective) arousing affect | Synonyms: poignant, touching |
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| affectingly | (adverb) in a poignant or touching manner | Synonyms: poignantly, touchingly |
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| benedictine | (noun) a French liqueur originally made by Benedictine monks | - |
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| collecting | (noun) the act of gathering something together | Synonyms: aggregation, assembling, collection |
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| conducting | (noun) the way of administering a business | - |
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| (noun) the direction of an orchestra or choir | - |
| conflicting | (adjective) in disagreement | Synonyms: at odds, contradictory, self-contradictory |
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| (adjective) on bad terms | - |
| constricting | (adjective) (of circumstances) tending to constrict freedom | Synonyms: constrictive, narrowing |
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| contracting | (noun) becoming infected | Synonyms: catching |
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| depicting | (noun) a representation by picture or portraiture | Synonyms: depiction, portrayal, portraying |
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| detecting | (noun) a police investigation to determine the perpetrator | Synonyms: detection, detective work, sleuthing |
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| directing | (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directional, directive, guiding |
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| erecting | (noun) the act of building or putting up | Synonyms: erection |
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| exacting | (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: fastidious |
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| (adjective) requiring precise accuracy | Synonyms: exigent |
| (adjective) severe and unremitting in making demands | Synonyms: stern, strict |
| exactingness | (noun) the quality or state of being demanding or unyielding. | - |
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| intersecting | (adjective) crossed or intersected in the form of an X | Synonyms: decussate, intersectant |
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| lectin | (noun) any of several plant glycoproteins that act like specific antibodies but are not antibodies in that they are not evoked by an antigenic stimulus | - |
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| nonconducting | (adjective) not able to conduct heat or electricity or sound | Synonyms: non-conducting, nonconductive |
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| nonintersecting | (adjective) (of lines, planes, or surfaces) never meeting or crossing | Synonyms: nonconvergent |
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| nonreflecting | (adjective) not capable of physical reflection | Synonyms: nonreflective |
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| overacting | (noun) poor acting by a ham actor | Synonyms: hamming |
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| pectin | (noun) any of various water-soluble colloidal carbohydrates that occur in ripe fruit and vegetables; used in making fruit jellies and jams | - |
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| pectinate | (adjective) like a comb | - |
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| pectineal | (adjective) of or relating to the pubis | - |
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| playacting | (noun) the performance of a part or role in a drama | Synonyms: acting, performing, playing |
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| projecting | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, protruding, relieved, sticking, sticking out |
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| prolactin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, luteotropin |
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| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| protecting | (adjective) shielding (or designed to shield) against harm or discomfort | - |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| reflecting | (adjective) causing reflection or having a device that reflects | - |
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| restricting | (adjective) restricting the scope or freedom of action | Synonyms: confining, constraining, constrictive, limiting |
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| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| semiconducting | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconductive |
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| spectinomycin | (noun) an antibiotic used to treat gonorrhea | - |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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| (noun) any of the artificially produced elements with atomic numbers greater than 103 | - |
| unaffecting | (adjective) not arousing affect | - |
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| unexacting | (adjective) not rigorous | - |
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| unsuspecting | (adjective) not suspicious | Synonyms: unsuspicious |
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| (adjective) (often followed by `of') not knowing or expecting; not thinking likely | - |
| unsuspectingly | (adverb) without suspicions | - |
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