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azimuth an arc measured horizontally and clockwise from a point north, in navigation, or a point south, in astronomy, to another point where a vertical circle intersects the horizon. [2 definitions]
azo- containing nitrogen.
azobenzene an orange-red, nonsoluble crystalline compound obtained from nitrobenzene, used in organic synthesis, as an insecticide, and in the making of dyes.
azoic see Archean.
Aztec a member of an Indian people who had an advanced civilization in central Mexico before the Spaniards conquered them in 1519. [4 definitions]
azure the color of a clear blue sky; sky blue. [2 definitions]
azurite a bright azure-blue mineral that serves as a copper ore. [2 definitions]
azygous in biology, not being part of a pair; occurring singly.
B symbol of the chemical element boron.
B- in the U.S. military, a plane used to transport and drop bombs, such as a B-17 or B-52.
b the second letter of the English alphabet. [5 definitions]
b. abbreviation of "born," brought into life by birth or in like manner (used to indicate the year or date of a birth).
B-1 a heavy U.S. jet bomber built for the 1980s.
B-17 a four-engine U.S. bomber extensively used in World War II; Flying Fortress.
B-29 a heavy U.S. bomber used late in World War II; Superfortress.
B-52 a heavy U.S. bomber with eight jet engines.
Ba symbol of the chemical element barium.
B.A. abbreviation of "Bachelor of Arts," an undergraduate degree conferred on a person who has completed a curriculum in the liberal arts; A.B.
baa to make the sound of a sheep; bleat. [2 definitions]
Baal any of various local deities, usu. fertility gods, worshiped by certain ancient Semitic peoples. [2 definitions]
baba au rhum a light, porous cake, usu. made with yeast and sometimes containing raisins or other dried fruit, that is soaked with rum before serving.