| 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 |
| almoner | (noun) an official in a British hospital who looks after the social and material needs of the patients | Synonyms: medical social worker |
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| alms | (noun) money or goods contributed to the poor | - |
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| almsgiver | (noun) a person who gives alms | - |
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| almsgiving | (noun) making voluntary contributions to aid the poor | Synonyms: alms-giving |
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| alocasia | (noun) any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries | Synonyms: elephant's ear, elephant ear |
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| aloe | (noun) succulent plants having rosettes of leaves usually with fiber like hemp and spikes of showy flowers; found chiefly in Africa | - |
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| aloes | (noun) a purgative made from the leaves of aloe | Synonyms: bitter aloes |
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| aloha | (noun) an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian) | Synonyms: ciao |
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| aloneness | (noun) a disposition toward being alone | Synonyms: loneliness, lonesomeness, solitariness |
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| aloofness | (noun) a disposition to be distant and unsympathetic in manner | Synonyms: remoteness, standoffishness, withdrawnness |
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| (noun) indifference by personal withdrawal | Synonyms: distance |
| alopecia | (noun) loss of hair (especially on the head) or loss of wool or feathers; in humans it can result from heredity or hormonal imbalance or certain diseases or drugs and treatments (chemotherapy for cancer) | - |
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| alp | (noun) any high mountain | - |
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| alpaca | (noun) domesticated llama with long silky fleece; believed to be a domesticated variety of the guanaco | Synonyms: Lama pacos |
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| (noun) a thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that wool | - |
| (noun) wool of the alpaca | - |
| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| alpha | (noun) the 1st letter of the Greek alphabet | - |
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| (noun) the beginning of a series or sequence | - |
| alphabet | (noun) the elementary stages of any subject (usually plural) | Synonyms: first principles, rudiments |
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| (noun) a character set that includes letters and is used to write a language | Synonyms: ABC's, ABC, ABCs |
| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| alprazolam | (noun) an antianxiety agent (trade name Xanax) of the benzodiazepine class | Synonyms: Xanax |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| altar | (noun) a raised structure on which gifts or sacrifices to a god are made | - |
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| (noun) the table in Christian churches where communion is given | Synonyms: communion table, Lord's table |
| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| alterability | (noun) the quality of being alterable | - |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| althea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, hollyhock |
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| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| 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) | - |
| alto | (noun) the pitch range of the lowest female voice | - |
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| (noun) (of a musical instrument) the second highest instrument in a family of musical instruments | - |
| (noun) the lowest female singing voice | Synonyms: contralto |
| (noun) the highest adult male singing voice | Synonyms: countertenor |
| (noun) a singer whose voice lies in the alto clef | - |
| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| altoist | (noun) a musician who plays the alto saxophone | Synonyms: alto saxophonist |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| altruism | (noun) the quality of unselfish concern for the welfare of others | Synonyms: selflessness |
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| altruist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: philanthropist |
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| alula | (noun) tuft of small stiff feathers on the first digit of a bird's wing | Synonyms: bastard wing, spurious wing |
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| (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: calypter |
| alum | (noun) a double sulphate of aluminum and potassium that is used as an astringent (among other things) | - |
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| (noun) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum | Synonyms: potash alum, potassium alum |
| (noun) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum | Synonyms: ammonia alum, ammonium alum |
| (noun) a person who has received a degree from a school (high school or college or university) | Synonyms: grad, graduate |
| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| alumna | (noun) a female person who has received a degree from a school (high school or college or university) | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alumroot | (noun) any of several herbs of the genus Heuchera | Synonyms: alumbloom |
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| alundum | (noun) a substance made of fused alumina | - |
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| alveolar | (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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