| alluvial | (adjective) of or relating to alluvium | - |
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| allyl | (noun) the univalent unsaturated organic radical C3H5; derived from propylene | Synonyms: allyl group, allyl radical |
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| alphabetical | (adjective) arranged in order according to the alphabet | Synonyms: alphabetic |
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| (adjective) relating to or expressed by a writing system that uses an alphabet | Synonyms: alphabetic |
| alphamerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphanumeric, alphanumerical |
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| alphanumerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumeric |
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| altitudinal | (adjective) pertaining to altitude | - |
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| altricial | (adjective) (of hatchlings) naked and blind and dependent on parents for food | - |
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| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| 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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| ambrosial | (adjective) worthy of the gods | Synonyms: ambrosian |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosian, nectarous |
| ambulacral | (adjective) pertaining to the ambulacra of radial echinoderms | - |
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| amenorrheal | (adjective) related to the suppression of normal menstrual flow for any reason other than pregnancy | Synonyms: amenorrheic, amenorrhoeal, amenorrhoeic |
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| amenorrhoeal | (adjective) related to the suppression of normal menstrual flow for any reason other than pregnancy | Synonyms: amenorrheal, amenorrheic, amenorrhoeic |
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| ammonal | (noun) Ammonal is an explosive made up of ammonium nitrate and aluminum powder. | - |
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| ammoniacal | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniac |
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| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| amphitheatrical | (adjective) of or related to an amphitheater | Synonyms: amphitheatric |
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| ampul | (noun) a small bottle that contains a drug (especially a sealed sterile container for injection by needle) | Synonyms: ampoule, ampule, phial, vial |
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| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amyl | (noun) a hydrocarbon radical that occurs in many organic compounds | - |
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| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| anaclinal | (adjective) of valleys and rivers; progressing in a direction opposite to the dip in surrounding rock strata | - |
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| anaglyphical | (adjective) related to anaglyphs or anaglyphy | Synonyms: anaglyphic, anaglyptic, anaglyptical |
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| anaglyptical | (adjective) related to anaglyphs or anaglyphy | Synonyms: anaglyphic, anaglyphical, anaglyptic |
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| anagogical | (adjective) based on or exemplifying anagoge | Synonyms: anagogic |
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| anagrammatical | (adjective) related to anagrams or containing or making an anagram | Synonyms: anagrammatic |
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| anal | (adjective) a stage in psychosexual development when the child's interest is concentrated on the anal region; fixation at this stage is said to result in orderliness, meanness, stubbornness, compulsiveness, etc. | Synonyms: anal retentive |
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| (adjective) of or related to the anus | - |
| analogical | (adjective) expressing, composed of, or based on an analogy | - |
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| analytical | (adjective) using or skilled in using analysis (i.e., separating a whole--intellectual or substantial--into its elemental parts or basic principles) | Synonyms: analytic |
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| (adjective) of a proposition that is necessarily true independent of fact or experience | Synonyms: analytic |
| anarchical | (adjective) without law or control | Synonyms: anarchic, lawless |
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| anatomical | (adjective) of or relating to the structure of the body | Synonyms: anatomic |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomic |
| (noun) an expression that relates to anatomy | Synonyms: anatomical reference |
| ancestral | (adjective) of or belonging to or inherited from an ancestor | - |
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| (adjective) inherited or inheritable by established rules (usually legal rules) of descent | Synonyms: hereditary, patrimonial, transmissible |
| anecdotal | (adjective) having the character of an anecdote | - |
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| (adjective) characterized by or given to telling anecdotes | Synonyms: anecdotic, anecdotical |
| anecdotical | (adjective) characterized by or given to telling anecdotes | Synonyms: anecdotal, anecdotic |
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| anemometrical | (adjective) pertaining to the measurement of wind speed and direction | Synonyms: anemometric |
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| anesthyl | (noun) a mixture of methyl and ethyl chloride; sprayed on as a local anesthetic | - |
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| aneurismal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismatic, aneurysmal, aneurysmatic |
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| aneurysmal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurismatic, aneurysmatic |
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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 |
| 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 |
| anginal | (adjective) of or related to the pain of angina pectoris | Synonyms: anginose, anginous |
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| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anil | (noun) shrub of West Indies and South America that is a source of indigo dye | Synonyms: Indigofera anil, Indigofera suffruticosa |
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| (noun) a blue dye obtained from plants or made synthetically | Synonyms: indigo, indigotin |
| animal | (adjective) marked by the appetites and passions of the body | Synonyms: carnal, fleshly, sensual |
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| (noun) a living organism characterized by voluntary movement | Synonyms: animate being, beast, brute, creature, fauna |
| anneal | (verb) bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling | Synonyms: normalize, temper |
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| annexal | (adjective) of or pertaining to adnexa | Synonyms: adnexal |
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| annexational | (adjective) relating to annexation | - |
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| annual | (adjective) completing its life cycle within a year | Synonyms: one-year |
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| (adjective) occurring or payable every year | Synonyms: yearly |
| (noun) a reference book that is published regularly once every year | Synonyms: yearbook, yearly |
| (noun) (botany) a plant that completes its entire life cycle within the space of a year | - |
| annul | (verb) cancel officially | Synonyms: countermand, lift, overturn, repeal, rescind, reverse, revoke, vacate |
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| (verb) declare invalid | Synonyms: avoid, invalidate, nullify, quash, void |
| anodal | (adjective) of or at or relating to an anode | Synonyms: anodic |
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| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| anorectal | (adjective) pertaining to the anus and rectum considered together | - |
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| antecubital | (adjective) of or relating to the region of the arm in front of the elbow | - |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antenatal | (adjective) occurring or existing before birth | Synonyms: antepartum, prenatal |
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| antennal | (adjective) of or relating to antennae | Synonyms: antennary |
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| antenuptial | (adjective) relating to events before a marriage | Synonyms: premarital, prenuptial |
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| antheral | (adjective) capable of fertilizing female organs | Synonyms: staminate |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| anthill | (noun) a mound of earth made by ants as they dig their nest | Synonyms: formicary |
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| anthropical | (adjective) relating to mankind or the period of mankind's existence | Synonyms: anthropic |
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| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| anthropological | (adjective) of or concerned with the science of anthropology | - |
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| anthropometrical | (adjective) of or relating to anthropometry | Synonyms: anthropometric |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
| anticlimactical | (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactic |
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| anticlinal | (adjective) sloping downward away from a common crest | - |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antidotal | (adjective) counteracting the effects of a poison | - |
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| antifungal | (adjective) capable of destroying fungi | Synonyms: fungicidal |
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| (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal agent, antimycotic, antimycotic agent, fungicide |
| antiheretical | (adjective) opposed to heresy | - |
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| antimalarial | (noun) a medicinal drug used to prevent or treat malaria | Synonyms: antimalarial drug |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
| antimonial | (adjective) containing antimony | - |
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| antiparallel | (adjective) (especially of vectors) parallel but oppositely directed | - |
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| antipathetical | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetic, averse, indisposed, loath, loth |
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| (adjective) characterized by antagonism or antipathy | Synonyms: antagonistic, antipathetic |
| antipersonnel | (adjective) designed to inflict death or personal injury rather than material destruction | - |
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| antiphonal | (adjective) containing or using responses; alternating | Synonyms: responsive |
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| (adjective) relating to or resembling an antiphon or antiphony | Synonyms: antiphonary |
| (noun) bound collection of antiphons | Synonyms: antiphonary |
| antipodal | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodean |
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| (noun) the relation of opposition along a diameter | Synonyms: antipodal opposition, diametrical opposition |
| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| antisocial | (adjective) shunning contact with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: asocial |
| antithetical | (adjective) sharply contrasted in character or purpose | Synonyms: antithetic |
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| 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 |
| antiviral | (adjective) inhibiting or stopping the growth and reproduction of viruses | - |
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| (noun) any drug that destroys viruses | Synonyms: antiviral agent, antiviral drug |
| anvil | (noun) a heavy block of iron or steel on which hot metals are shaped by hammering | - |
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| (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: incus |
| aortal | (adjective) of or relating to the aorta | Synonyms: aortic |
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| aphrodisiacal | (adjective) stimulating sexual desire | Synonyms: aphrodisiac, sexy |
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| apical | (adjective) situated at an apex | - |
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| apicultural | (adjective) relating to the care and breeding of bees | - |
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| aplacental | (adjective) having no placenta | - |
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| apocalyptical | (adjective) prophetic of devastation or ultimate doom | Synonyms: apocalyptic, revelatory |
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| apocryphal | (adjective) being of questionable authenticity | - |
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| apodal | (adjective) (of snakes and eels) naturally footless | Synonyms: apodous |
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| apolitical | (adjective) politically neutral | Synonyms: unpolitical |
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| apomictical | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictic |
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| apophyseal | (adjective) of or relating to an apophysis | - |
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| apostolical | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolic |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolic, papal, pontifical |
| apothecial | (adjective) of or relating to the apothecium of some lichens and fungi | - |
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| apothegmatical | (adjective) given to or characterized by terse apothegms | Synonyms: apothegmatic |
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| appal | (verb) strike with disgust or revulsion | Synonyms: appall, offend, outrage, scandalise, scandalize, shock |
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| (verb) fill with apprehension or alarm; cause to be unpleasantly surprised | Synonyms: alarm, appall, dismay, horrify |