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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 the British spelling of aluminum.
aluminize to treat or cover with some form of aluminum.
aluminous of or pertaining to alum or alumina.
aluminum a chemical element that has thirteen protons in each nucleus, occurs commonly in ores such as bauxite, and in pure form is a strong lightweight corrosion-resistant silvery metal with many industrial uses. (symbol: Al)
aluminum hydroxide a white, water-insoluble powder used as an antacid and to waterproof fabric and manufacture glass.
aluminum oxide a natural or synthetic oxide of aluminum; alumina; corundum.
aluminum sulfate a white, water-soluble substance used to purify water, manufacture paper, and fix dyes.
alumna a female graduate or former student of an educational institution.
alumnus a male graduate or former student of an educational institution.
Álvar Nuñez Cabeza de Vaca a Spanish explorer who, after landing on the cape of Florida in 1528 and being stranded in the Gulf coast region for 8 years, published an account of his survival and interaction with the native peoples under the title "La relación" (1542) (b.1490?--d.1557?).
alveolar of or pertaining to small cavities such as the terminal air sacs of the lungs or the cells of a honeycomb. [4 definitions]
alveolate containing many cavities or pits; honeycombed.
alveolus a small cavity or pit, such as one of the terminal air sacs of the lungs or one cell of a honeycomb. [2 definitions]