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alternative fuel a fuel other than fossil fuel used to power an internal combustion engine.
alternative medicine any medical treatment or therapy, such as homeopathy and acupuncture, that is considered nontraditional and is generally not taught in conventional medical schools.
alternator a generator which produces alternating electrical current.
althea any of a group of plants having tall spikes of flowers, such as hollyhocks.
Althea Gibson U.S. professional tennis player, who was the first African-American woman to win all the major world singles tennis titles (b.1927--d.2003).
althorn any of various brass wind instruments in the alto or tenor range, esp. the altosaxhorn; alto horn.
although in spite of the fact that; even though; though.
altimeter an altitude-measuring device such as a specially calibrated barometer.
altitude the height of a given object or location above a specified base, such as sea level or earth. [4 definitions]
alto the vocal range between tenor and soprano, being the lowest for the female and highest for the male. [5 definitions]
alto clef in musical notation, a clef with middle C on the middle line of the staff, or the sign identifying this clef; viola clef.
altocumulus a cloud having rounded, fluffy edges and a white or gray color, found at medium altitudes.
altogether thoroughly; totally. [3 definitions]
altoist in jazz, one who plays alto saxophone.
altostratus a thick dense cloud that forms a uniform gray sheet that often produces precipitation, found at medium altitudes.
altruism unselfish concern for the well-being of others. (Cf. egoism.)
altruistic unselfishly devoted to the welfare of others. [2 definitions]
alum an astringent chemical solid used as a styptic and in tanning and dyeing. [2 definitions]
alumina natural or synthetic aluminum oxide, occurring in nature as a corundum.
aluminium British spelling of aluminum.
aluminize to treat or cover with some form of aluminum.