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alpha particle a positively charged particle given off as radiation from some fission or decay processes, consisting of two protons and two neutrons.
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.