| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| alkyd | (noun) a durable synthetic resin widely used in adhesives and paints | Synonyms: alkyd resin |
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| allamanda | (noun) a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes | - |
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| allantoid | (adjective) shaped like a sausage | Synonyms: sausage-shaped |
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| allargando | (adjective) (music) gradually decreasing in tempo and broadening in manner | - |
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| alleged | (adjective) declared but not proved | - |
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| (adjective) doubtful or suspect | Synonyms: so-called, supposed |
| allegedly | (adverb) according to what has been alleged | - |
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| allemande | (noun) egg-thickened veloute | Synonyms: allemande sauce |
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| alleviated | (adjective) (of pain or sorrow) made easier to bear | Synonyms: eased, relieved |
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| allgood | (noun) European plant naturalized in North America; often collected from the wild as a potherb | Synonyms: Chenopodium bonus-henricus, fat hen, good-king-henry, wild spinach |
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| allied | (adjective) joined by treaty or agreement | - |
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| (adjective) related by common characteristics or ancestry | - |
| (adjective) united in a confederacy or league | Synonyms: confederate, confederative |
| alligatored | (adjective) of paint or varnish; having the appearance of alligator hide | Synonyms: cracked |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| allotted | (adjective) given as a task | - |
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| alloyed | (adjective) (used of metals) blended to obtain a desired property | - |
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| (adjective) (used of metals) debased by mixture with an inferior element | - |
| allude | (verb) make a more or less disguised reference to | Synonyms: advert, touch |
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| almandine | (noun) a purple variety of the ruby spinel | - |
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| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| almond | (noun) oval-shaped edible seed of the almond tree | - |
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| (noun) small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California | Synonyms: Amygdalus communis, Prunus amygdalus, Prunus dulcis, sweet almond |
| alongside | (adverb) side by side | Synonyms: aboard |
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| aloud | (adverb) using the voice; not silently | Synonyms: out loud |
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| (adverb) with relatively high volume | Synonyms: loud, loudly |
| alphabetised | (adjective) having been put in alphabetical order | Synonyms: alphabetized |
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| alphabetized | (adjective) having been put in alphabetical order | Synonyms: alphabetised |
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| already | (adverb) prior to a specified or implied time | - |
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| altered | (adjective) changed in form or character without becoming something else | - |
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| (adjective) having testicles or ovaries removed | Synonyms: neutered |
| (adjective) changed in order to improve or made more fit for a particular purpose | Synonyms: adapted |
| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| altitudinal | (adjective) pertaining to altitude | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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| alundum | (noun) a substance made of fused alumina | - |
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| amadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: avadavat |
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| amalgamated | (adjective) joined together into a whole | Synonyms: amalgamate, coalesced, consolidated, fused |
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| amazed | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: astonied, astonished, astounded, stunned |
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| ambassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: embassador |
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| (noun) an informal representative | - |
| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| ambassadorship | (noun) the post of ambassador | - |
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| ambassadress | (noun) a woman ambassador | - |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambush, bushwhack, lie in wait, lurk, scupper, waylay |
| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| ameboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: amoeboid |
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| amend | (verb) to make better | Synonyms: ameliorate, better, improve, meliorate |
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| (verb) set straight or right | Synonyms: rectify, remediate, remedy, repair |
| (verb) make amendments to | - |
| amendable | (adjective) capable of being corrected by additions | Synonyms: correctable |
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| amendatory | (adjective) effecting amendment | - |
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| amended | (adjective) of legislation | - |
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| (adjective) modified for the better | - |
| amendment | (noun) the act of amending or correcting | - |
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| (noun) a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) | - |
| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| amide | (noun) any organic compound containing the group -CONH2 | - |
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| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| amidship | (adjective) located in the middle part of a ship or aircraft | - |
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| (adverb) at or near or toward the center of a ship | Synonyms: amidships, midships |
| (adverb) at or near or toward the middle | - |
| amidships | (adverb) at or near or toward the center of a ship | Synonyms: amidship, midships |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| ammoniated | (adjective) combined or treated with ammonia | - |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| amoeboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: ameboid |
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| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphipod | (noun) a kind of malacostracan crustacean | - |
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| amplitude | (noun) greatness of magnitude | - |
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| (noun) the property of copious abundance | Synonyms: bountifulness, bounty |
| (noun) (physics) the maximum displacement of a periodic wave | - |
| amused | (adjective) pleasantly occupied | Synonyms: diverted, entertained |
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| amygdala | (noun) an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior | Synonyms: amygdaloid nucleus, corpus amygdaloideum |
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| amygdaliform | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaloid, amygdaloidal |
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| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| amygdaline | (adjective) related to or resembling an almond | - |
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| amygdaloid | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloidal |
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| (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyloid | (adjective) resembling starch | Synonyms: amylaceous, amyloidal, farinaceous, starchlike |
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| (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| amyloidosis | (noun) a disorder characterized by deposit of amyloid in organs or tissues; often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma | - |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| anadiplosis | (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: reduplication |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| analysand | (noun) a person undergoing psychoanalysis | - |
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| analyzed | (adjective) examined carefully and methodically; broken down for consideration of constituent parts | - |
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| anaphrodisia | (noun) decline or absence of sexual desire | - |
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| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
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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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| andante | (adjective) (of tempo) moderately slow | - |
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| (noun) a musical composition or musical passage to be performed moderately slow | - |
| (noun) a moderately slow tempo (a walking pace) | - |
| (adverb) at a moderately slow tempo | - |
| andantino | (adjective) (of tempo) moderately fast | - |
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| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| andesite | (noun) a dark grey volcanic rock | - |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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| 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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| andrena | (noun) a bee that is a member of the genus Andrena | Synonyms: andrenid, mining bee |
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| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| androecium | (noun) a male gametoecium | - |
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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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| androgenetic | (adjective) of or related to androgenesis | Synonyms: androgenous |
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| androgenic | (adjective) of or related to the male hormone androgen | - |
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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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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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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |