| amethyst | (adjective) of a moderate purple color | - |
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| (noun) a transparent purple variety of quartz; used as a gemstone | - |
| amethystine | (adjective) containing or resembling amethyst | - |
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| ametria | (noun) congenital absence of the uterus | - |
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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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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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| amphetamine | (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: pep pill, speed, upper |
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| amulet | (noun) a trinket or piece of jewelry usually hung about the neck and thought to be a magical protection against evil or disease | Synonyms: talisman |
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| anaesthetic | (adjective) relating to or producing insensibility | Synonyms: anesthetic |
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| (adjective) characterized by insensibility | Synonyms: anesthetic |
| (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic agent, anesthetic, anesthetic agent |
| anaesthetise | (verb) administer an anesthetic drug to | Synonyms: anaesthetize, anesthetise, anesthetize, put out, put under |
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| anaesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anesthesiologist, anesthetist |
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| anaesthetize | (verb) administer an anesthetic drug to | Synonyms: anaesthetise, anesthetise, anesthetize, put out, put under |
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| analgetic | (adjective) capable of relieving pain | Synonyms: analgesic, anodyne |
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| analphabet | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabetic |
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| analphabetic | (adjective) not alphabetic | - |
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| (adjective) relating to or expressed by a writing system that is not alphabetic | - |
| (adjective) having little acquaintance with writing | Synonyms: unlettered |
| (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
| analphabetism | (noun) an inability to read | Synonyms: illiteracy |
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| androgenetic | (adjective) of or related to androgenesis | Synonyms: androgenous |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anemometer | (noun) a gauge for recording the speed and direction of wind | Synonyms: wind gage, wind gauge |
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| anemometric | (adjective) pertaining to the measurement of wind speed and direction | Synonyms: anemometrical |
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| anemometrical | (adjective) pertaining to the measurement of wind speed and direction | Synonyms: anemometric |
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| anemometry | (noun) measuring wind speed and direction | - |
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| anesthetic | (adjective) relating to or producing insensibility | Synonyms: anaesthetic |
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| (adjective) characterized by insensibility | Synonyms: anaesthetic |
| (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic, anaesthetic agent, anesthetic agent |
| anesthetise | (verb) administer an anesthetic drug to | Synonyms: anaesthetise, anaesthetize, anesthetize, put out, put under |
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| anesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthesiologist |
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| anesthetize | (verb) administer an anesthetic drug to | Synonyms: anaesthetise, anaesthetize, anesthetise, put out, put under |
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| anethole | (noun) an organic compound that is widely used as a flavoring substance. | Synonyms: anise camphor |
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| anisette | (noun) liquorice-flavored usually colorless sweet liqueur made from aniseed | Synonyms: anisette de Bordeaux |
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| anisogamete | (noun) either of a pair of unlike gametes especially those unlike in size | - |
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| anisogametic | (adjective) relating to either of a pair of dissimilar (anisogamic) gametes combining in sexual reproduction | - |
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| anisometric | (adjective) having unsymmetrical parts or unequal dimensions or measurements | Synonyms: unsymmetrical |
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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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| anklet | (noun) an ornament worn around the ankle | Synonyms: ankle bracelet |
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| (noun) a sock that reaches just above the ankle | Synonyms: anklets, bobbysock, bobbysocks |
| (noun) a shoe for a child or woman that has a strap around the ankle | - |
| anklets | (noun) a sock that reaches just above the ankle | Synonyms: anklet, bobbysock, bobbysocks |
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| annulet | (noun) molding in the form of a ring; at top of a column | Synonyms: bandelet, bandelette, bandlet, square and rabbet |
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| (noun) (heraldry) a charge in the shape of a small ring | - |
| anthropogenetic | (adjective) of or relating to the study of the origins and development of human beings | Synonyms: anthropogenic |
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| anthropometric | (adjective) of or relating to anthropometry | Synonyms: anthropometrical |
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| anthropometrical | (adjective) of or relating to anthropometry | Synonyms: anthropometric |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antiemetic | (noun) a drug that prevents or alleviates nausea and vomiting | Synonyms: antiemetic drug |
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| antiferromagnet | (noun) any material that has antiferromagnetic properties. | - |
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| antiferromagnetic | (adjective) relating to antiferromagnetism | - |
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| antiferromagnetism | (noun) magnetic field creates parallel but opposing spins; varies with temperature | - |
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| antiheretical | (adjective) opposed to heresy | - |
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| antimagnetic | (adjective) impervious to the effects of a magnetic field; resistant to magnetization | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| antipathetic | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetical, averse, indisposed, loath, loth |
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| (adjective) characterized by antagonism or antipathy | Synonyms: antagonistic, antipathetical |
| 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 |
| antipyretic | (adjective) preventing or alleviating fever | - |
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| (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
| antithetic | (adjective) sharply contrasted in character or purpose | Synonyms: antithetical |
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| antithetical | (adjective) sharply contrasted in character or purpose | Synonyms: antithetic |
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| antithetically | (adverb) with antithesis; in an antithetical manner | - |
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| anuretic | (adjective) of or relating to an inability to urinate | Synonyms: anuric |
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| anxiety | (noun) a vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfortune | - |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiousness |
| apathetic | (adjective) showing little or no emotion or animation | - |
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| (adjective) marked by a lack of interest | Synonyms: indifferent |
| apathetically | (adverb) in an apathetic manner | - |
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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| aphaeretic | (adjective) relating to or formed by or consisting of aphaeresis | Synonyms: apheretic |
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| apheretic | (adjective) relating to or formed by or consisting of aphaeresis | Synonyms: aphaeretic |
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| aphetic | (adjective) produced by aphesis | - |
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| apogametic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogamic, apogamous |
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| apologetic | (adjective) offering or expressing apology | Synonyms: excusatory |
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| apologetically | (adverb) in an apologetic manner | - |
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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| aposiopetic | (adjective) relating to or characteristic of aposiopesis | - |
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| appetence | (noun) a feeling of craving something | Synonyms: appetency, appetite |
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| appetency | (noun) a feeling of craving something | Synonyms: appetence, appetite |
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| appetent | (adjective) marked by eager desire | - |
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| appetiser | (noun) food or drink to stimulate the appetite (usually served before a meal or as the first course) | Synonyms: appetizer, starter |
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| appetising | (adjective) appealing to or stimulating the appetite especially in appearance or aroma | Synonyms: appetizing |
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| appetisingness | (noun) the property of stimulating the appetite | Synonyms: appetizingness |
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| appetite | (noun) a feeling of craving something | Synonyms: appetence, appetency |
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| appetitive | (adjective) of or relating to appetite | - |
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| appetizer | (noun) food or drink to stimulate the appetite (usually served before a meal or as the first course) | Synonyms: appetiser, starter |
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| appetizing | (adjective) appealing to or stimulating the appetite especially in appearance or aroma | Synonyms: appetising |
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| appetizingness | (noun) the property of stimulating the appetite | Synonyms: appetisingness |
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| applet | (noun) a Java application; an application program that uses the client's web browser to provide a user interface | - |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetype | (noun) something that serves as a model or a basis for making copies | Synonyms: original, pilot |
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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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| arete | (noun) a sharp narrow ridge found in rugged mountains | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| arietta | (noun) a short aria | Synonyms: short aria |
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| arithmetic | (adjective) relating to or involving arithmetic | Synonyms: arithmetical |
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| (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
| arithmetical | (adjective) relating to or involving arithmetic | Synonyms: arithmetic |
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| arithmetically | (adverb) with respect to arithmetic | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| armet | (noun) a medieval helmet with a visor and a neck guard | - |
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| armlet | (noun) a band worn around the arm for decoration | Synonyms: arm band |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| ascetic | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetical |
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| (adjective) practicing great self-denial | Synonyms: ascetical, austere, spartan |
| (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
| ascetical | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetic |
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| (adjective) practicing great self-denial | Synonyms: ascetic, austere, spartan |
| ascetically | (adverb) in an ascetic manner | - |
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