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| A3 |
abbreviation of "angstrom" or "angstroms," a unit of length equal to one hundred-millionth of a centimeter, used in measuring light waves. |
| acetylene |
a highly flammable colorless gas used esp. to cut and weld metal and to give light. |
| actinic rays |
electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion. |
| advertise |
to present (a product or idea) in a favorable light to win public patronage, support, or approval. [1/4 definitions] |
| afterglow |
the light, or the impression of light, that lingers after its source or cause is gone, as after a sunset. [1/2 definitions] |
| against |
in contrast with, esp. dark on light. [1/5 definitions] |
| aglimmer |
putting forth a faint or fluctuating light; glimmering. |
| aglitter |
reflecting a sparkling light; glittering. |
| aglow |
shining or filled with a soft light; glowing. [1/2 definitions] |
| airiness |
the quality or condition of being confidently carefree or light. [1/2 definitions] |
| air well |
a usu. central court that is enclosed by the exterior walls of a building and provides air and light. |
| airy |
being of a thin or light appearance. [2/5 definitions] |
| albedo |
the degree to which a planet, asteroid, or the like reflects light. [1/2 definitions] |
| allegretto |
light, graceful, and quick in tempo, but slower than allegro (used as a musical direction). [1/2 definitions] |
| almond |
a light tan color resembling that of the flesh of the almond. [1/6 definitions] |
| angel food cake |
a light white sponge cake made of beaten egg whites, cream of tartar, flour, and sugar. |
| angstrom |
(often cap.) a unit of length equal to one hundred-millionth of a centimeter, used in measuring light waves; angstrom unit. (abbr.: A, A.U.) |
| aperture |
an opening, often adjustable, that controls the amount of light reaching the lens on a camera or other optical instrument. [1/2 definitions] |
| Apollo |
in Greek and Roman mythology, the god of light, prophecy, music, poetry, and medicine. [1/2 definitions] |
| aqua |
a light greenish blue or blue-green color. [1/2 definitions] |
| arc lamp |
a lamp, such as a searchlight, in which light is produced by an electric arc passing through a gas between two hot electrodes; arc light. |
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