| abele | (noun) a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces | Synonyms: aspen poplar, Populus alba, silver-leaved poplar, white aspen, white poplar |
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| abelia | (noun) any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico | - |
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| abelmosk | (noun) bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus | Synonyms: Abelmoschus moschatus, Hibiscus moschatus, musk mallow |
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| abortively | (adverb) in an unfruitful manner | - |
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| absolutely | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: dead, perfectly, utterly |
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| (adverb) totally and definitely; without question | - |
| abstrusely | (adverb) in a manner difficult to understand | - |
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| abusively | (adverb) in an abusive manner | - |
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| acarpellous | (adjective) having no carpels | Synonyms: acarpelous |
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| acarpelous | (adjective) having no carpels | Synonyms: acarpellous |
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| accelerando | (adjective) (music) gradually increasing in tempo | - |
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| (noun) a gradually increasing tempo of music | - |
| (adverb) with increasing speed | - |
| accelerate | (verb) move faster | Synonyms: quicken, speed, speed up |
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| (verb) cause to move faster | Synonyms: speed, speed up |
| accelerated | (adjective) speeded up, as of an academic course | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerative | (adjective) tending to increase velocity | Synonyms: acceleratory |
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| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| acceleratory | (adjective) tending to increase velocity | Synonyms: accelerative |
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| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accurately | (adverb) with few mistakes | - |
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| (adverb) strictly correctly | - |
| acellular | (adjective) not made up of or divided into cells | Synonyms: noncellular |
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| actively | (adverb) in an active manner | - |
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| acutely | (adverb) having a rapid onset | - |
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| (adverb) in a keen or penetrating way | Synonyms: keenly |
| (adverb) changing suddenly in direction and degree | Synonyms: sharp, sharply |
| (adverb) in a shrewd manner | Synonyms: astutely, sagaciously, sapiently, shrewdly |
| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| adequately | (adverb) in an adequate manner or to an adequate degree | - |
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| adjectively | (adverb) as an adjective | - |
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| administratively | (adverb) by or for an administrator | - |
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| adversely | (adverb) in an adverse manner | - |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| affectionately | (adverb) with affection | Synonyms: dear, dearly |
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| affirmatively | (adverb) in an affirmative manner | - |
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| afield | (adverb) off the subject; beyond the point at issue | - |
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| (adverb) in or into a field (especially a field of battle) | - |
| (adverb) far away from home or one's usual surroundings | Synonyms: abroad |
| ageless | (adjective) continuing forever or indefinitely | Synonyms: aeonian, eonian, eternal, everlasting, perpetual, unceasing, unending |
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| agelessness | (noun) the quality of being timeless and eternal | - |
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| agelong | (adjective) lasting through all time | - |
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| aggressively | (adverb) in an aggressive manner | Synonyms: sharply |
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| agilely | (adverb) in a nimble or agile manner; with quickness and lightness and ease | Synonyms: nimbly |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| allele | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allelomorph |
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| allelic | (adjective) of or relating to alleles | Synonyms: allelomorphic |
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| allelomorph | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allele |
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| allelomorphic | (adjective) of or relating to alleles | Synonyms: allelic |
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| alliteratively | (adverb) in an alliterative manner | - |
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| alternately | (adverb) in an alternating sequence or position | - |
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| alternatively | (adverb) in place of, or as an alternative to | Synonyms: instead, or else |
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| amarelle | (noun) pale red sour cherry with colorless or nearly colorless juice | - |
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| (noun) any of several cultivated sour cherry trees bearing pale red fruit with colorless juice | Synonyms: Prunus cerasus caproniana |
| amberbell | (noun) eastern North American dogtooth having solitary yellow flowers marked with brown or purple and spotted interiors | Synonyms: Erythronium americanum, trout lily, yellow adder's tongue |
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| amelia | (noun) congenital absence of an arm or leg | - |
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| ameliorate | (verb) get better | Synonyms: better, improve, meliorate |
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| (verb) to make better | Synonyms: amend, better, improve, meliorate |
| ameliorating | (adjective) tending to ameliorate | Synonyms: ameliorative, amelioratory, meliorative |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| ameliorative | (adjective) tending to ameliorate | Synonyms: ameliorating, amelioratory, meliorative |
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| amelioratory | (adjective) tending to ameliorate | Synonyms: ameliorating, ameliorative, meliorative |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| anele | (verb) administer an oil or ointment to; often in a religious ceremony of blessing | Synonyms: anoint, embrocate, inunct, oil |
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| angel | (noun) spiritual being attendant upon God | - |
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| (noun) someone who provides financial support for some venture | Synonyms: backer |
| (noun) person of exceptional holiness | Synonyms: holy man, holy person, saint |
| angelfish | (noun) sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do | Synonyms: angel shark, monkfish, Squatina squatina |
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| (noun) a butterfly fish of the genus Pomacanthus | - |
| (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: Chaetodipterus faber, spadefish |
| angelic | (adjective) of or relating to angels | Synonyms: angelical |
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| (adjective) marked by utter benignity; resembling or befitting an angel or saint | Synonyms: angelical, beatific, sainted, saintlike, saintly |
| (adjective) having a sweet nature befitting an angel or cherub | Synonyms: angelical, cherubic, seraphic, sweet |
| angelica | (noun) aromatic stems or leaves or roots of Angelica Archangelica | - |
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| (noun) candied stalks of the angelica plant | - |
| (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelique |
| angelical | (adjective) of or relating to angels | Synonyms: angelic |
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| (adjective) marked by utter benignity; resembling or befitting an angel or saint | Synonyms: angelic, beatific, sainted, saintlike, saintly |
| (adjective) having a sweet nature befitting an angel or cherub | Synonyms: angelic, cherubic, seraphic, sweet |
| angelically | (adverb) like an angel | - |
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| angelim | (noun) any of several tropical American trees of the genus Andira | Synonyms: andelmin |
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| angelique | (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelica |
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| angelology | (noun) the branch of theology that is concerned with angels | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| annelid | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelidan |
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| (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
| annelidan | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelid |
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| anopheline | (adjective) relating to or characteristic of malaria mosquitoes | - |
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| (noun) any mosquito of the genus Anopheles | - |
| antebellum | (adjective) belonging to a period before a war especially the American Civil War | - |
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| antelope | (noun) graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks | - |
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| anthelminthic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelmintic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
| anthelmintic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antiparallel | (adjective) (especially of vectors) parallel but oppositely directed | - |
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| antipersonnel | (adjective) designed to inflict death or personal injury rather than material destruction | - |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antisatellite | (adjective) of or relating to a system to destroy satellites in orbit | Synonyms: ASAT |
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| apelike | (adjective) being or given to servile imitation | Synonyms: apish |
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| (adjective) resembling apes | Synonyms: anthropoid, anthropoidal |
| aphelion | (noun) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun | - |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| apparel | (noun) clothing in general | Synonyms: clothes, dress, wearing apparel |
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| (verb) provide with clothes or put clothes on | Synonyms: clothe, dress, enclothe, fit out, garb, garment, habilitate, raiment, tog |
| appareled | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: attired, dressed, garbed, garmented, habilimented, robed |
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| appellant | (adjective) of or relating to or taking account of appeals (usually legal appeals) | Synonyms: appellate |
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| (noun) the party who appeals a decision of a lower court | Synonyms: plaintiff in error |
| appellate | (adjective) of or relating to or taking account of appeals (usually legal appeals) | Synonyms: appellant |
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| appellation | (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellative, denomination, designation |
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| (noun) a geographical indication used to identify where the grapes for a wine are grown | - |
| appellative | (adjective) pertaining to or dealing with or used as a common noun | - |
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| (adjective) inclined to or serving for the giving of names | Synonyms: naming |
| (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellation, denomination, designation |
| appositively | (adverb) in an appositive manner | Synonyms: in apposition |
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| appreciatively | (adverb) with appreciation; in a grateful manner | Synonyms: gratefully |
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| apprehensively | (adverb) with anxiety or apprehension | Synonyms: anxiously, uneasily |
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| appropriately | (adverb) in accordance with what is appropriate or suitable for the circumstances | Synonyms: befittingly, duly, fitly, fittingly, properly, suitably |
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| approximately | (adverb) (of quantities) imprecise but fairly close to correct | Synonyms: about, around, close to, just about, more or less, or so, roughly, some |
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| arcella | (noun) an amoeba-like protozoan with a chitinous shell resembling an umbrella | - |
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| archangel | (noun) an angel ranked above the highest rank in the celestial hierarchy | - |
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| (noun) a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally | Synonyms: Angelica Archangelica, garden angelica |
| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| archipelago | (noun) a group of many islands in a large body of water | - |
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