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alpha ray radiation composed of alpha particles.
alpha wave the type of brain wave that is a sign of relaxation, having frequencies from eight to thirteen hertz; alpha rhythm.
Alpheratz a bright star in the constellations Pegasus and Andromeda, having a magnitude of 2.0.
alphorn see alpenhorn.
Alpine (l.c.) of, like, living in, or characteristic of high mountains or mountain regions above the timberline. [4 definitions]
alpinist one who climbs in the Alps or other similar mountains. [2 definitions]
Alps a high mountain range extending from southern France through Switzerland, Italy, Germany, and Austria, and into Yugoslavia and Albania.
already by or before this time or that time; previously. [3 definitions]
alright all right; unharmed or undamaged, or free of the risk of harm or damage. [4 definitions]
Alsatian one of a breed of large dogs having a thick brownish or black coat, often used as guard dogs and as guide dogs for the blind; German shepherd.
also in addition; as well; too. [3 definitions]
also-ran (informal) one who lost in an athletic or political competition.
alt.1 abbreviation of "alternate," one authorized to act in place of another; substitute.
alt.2 abbreviation of "altitude," the height of a given object or location above a specified base, such as sea level or earth, esp. the angular distance of a celestial body, measured from the horizon.
Altaic a family of languages that includes Turkic, Mongolian, Tungusic, and Korean. [3 definitions]
Altai Mountains a central Asian mountain range that extends from western Mongolia into Russia and China.
Altair the brightest star in the constellation Aquila, having a magnitude of 0.8.
altar a raised structure, often a table or platform, upon or at which sacrifices or other religious ceremonies are performed.
altar boy a young male person who assists the clergy in religious services; acolyte.
altar girl a young female person who assists the clergy in religious services; acolyte.
altarpiece a work of art that decorates the area above and behind an altar.