| 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.) |
| altruist |
a person who feels unselfish concern for the well-being of others and acts upon this concern in some way. |
| 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. |
| 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. |