| accipitrine | (adjective) of or relating to or belonging to the genus Accipiter (or to typical hawks) | - |
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| acroscopic | (adjective) facing or on the side toward the apex | - |
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| adrenocorticotropic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotrophic |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aesculapian | (adjective) of or belonging to Aesculapius or the healing art | Synonyms: medical |
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| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| allotropic | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropical |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| alpine | (adjective) relating to or characteristic of alps | - |
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| (adjective) living or growing above the timber line | - |
| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| amblyopic | (adjective) pertaining to a kind of visual impairment without apparent organic pathology | - |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| ametropic | (adjective) of or relating to an abnormal condition of the eye in which visual images are not in focus on the retina | - |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
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| angiocarpic | (adjective) having or being fruit enclosed in a shell or husk | Synonyms: angiocarpous |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anisometropic | (adjective) relating to a difference in the refractive power of the two eyes | - |
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| anisotropic | (adjective) not invariant with respect to direction | - |
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| anisotropically | (adverb) in an anisotropic manner | - |
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| anopia | (noun) sightlessness (especially because of a structural defect in or the absence of an eye) | - |
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| anorthopia | (noun) distorted vision in which straight lines appear curved | - |
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| anthropic | (adjective) relating to mankind or the period of mankind's existence | Synonyms: anthropical |
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| anthropical | (adjective) relating to mankind or the period of mankind's existence | Synonyms: anthropic |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| antitypic | (adjective) of or relating to an antitype that is a symbol | Synonyms: antitypical |
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| (adjective) of or relating to an antitype that represents an opposite | Synonyms: antitypical |
| antitypical | (adjective) of or relating to an antitype that is a symbol | Synonyms: antitypic |
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| (adjective) of or relating to an antitype that represents an opposite | Synonyms: antitypic |
| apian | (adjective) relating to or having the characteristics of bees | - |
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| apiarian | (adjective) relating to bees or beekeeping | - |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| apical | (adjective) situated at an apex | - |
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| apicalization | (noun) (phonetics) An articulatory feature of phones, usually consonants, produced by obstructing the air passage with the tip of the tongue. | - |
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| apiculate | (adjective) (of a leaf shape) having a short sharply pointed tip | - |
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| apicultural | (adjective) relating to the care and breeding of bees | - |
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| apiculture | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: beekeeping |
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| apiculturist | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, beekeeper |
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| apiece | (adverb) to or from every one of two or more (considered individually) | Synonyms: each, for each one, from each one, to each one |
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| apish | (adjective) being or given to servile imitation | Synonyms: apelike |
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| apishamore | (noun) a saddle blanket made of buffalo hide | - |
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| apivorous | (adjective) feeding on bees | - |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| aspirant | (adjective) desiring or striving for recognition or advancement | Synonyms: aspiring, wishful |
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| (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
| aspirate | (noun) a consonant pronounced with aspiration | - |
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| (noun) a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds. | - |
| (verb) inhale (air, water, etc.) | - |
| (verb) pronounce with aspiration; of stop sounds | - |
| (verb) remove by suction | Synonyms: draw out, suck out |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| aspire | (verb) have an ambitious plan or a lofty goal | Synonyms: aim, draw a bead on, shoot for |
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| aspirer | (noun) an ambitious and aspiring young person | Synonyms: aspirant, hopeful, wannabe, wannabee |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| aspiring | (adjective) desiring or striving for recognition or advancement | Synonyms: aspirant, wishful |
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| asthenopia | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: eyestrain |
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| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| atypic | (adjective) not representative of a group, class, or type | Synonyms: atypical, untypical |
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| atypical | (adjective) not representative of a group, class, or type | Synonyms: atypic, untypical |
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| (adjective) deviating from normal expectations; somewhat odd, strange, or abnormal | Synonyms: irregular |
| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| atypically | (adverb) in a manner that is not typical | Synonyms: untypically |
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| auspicate | (verb) commence in a manner calculated to bring good luck | - |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| auspiciously | (adverb) in an auspicious manner | Synonyms: propitiously |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autotypic | (adjective) of or relating to autotypy | - |
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| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| bagpipe | (noun) a tubular wind instrument; the player blows air into a bag and squeezes it out through the drone | - |
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| bagpiper | (noun) someone who plays the bagpipe | Synonyms: piper |
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| basiscopic | (adjective) facing or on the side toward the base | - |
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| beekeeping | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: apiculture |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
| bicuspidate | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspid |
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| biopiracy | (noun) biological theft; illegal collection of indigenous plants by corporations who patent them for their own use | - |
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| biotypic | (adjective) of or relating to a biotype | - |
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| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blimpish | (adjective) pompously ultraconservative and nationalistic | - |
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| blowpipe | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowtube |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowtube |
| bookkeeping | (noun) the activity of recording business transactions | Synonyms: clerking |
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| bpi | (noun) a measure of how densely information is packed on a storage medium | Synonyms: bits per inch |
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| breastpin | (noun) a decorative pin worn by women | Synonyms: broach, brooch |
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| bronchoscopic | (adjective) of or relating to an instrument for examining the interior of the bronchi | - |
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| bumpiness | (noun) the texture of a surface that has many bumps | - |
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