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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 with a soft light; glowing; bright. [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 |
open to the flow of air. [2 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 like the inner part of the seed of the almond. [1/3 definitions] |
| aluminium |
the British word for "aluminum," a strong, light, silver metal that does not easily rust. |
| aluminum |
a strong, light metal with a silver color. It is used to make things such as cooking pots, car parts, and foil. |
| 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 that controls the amount of light that reaches the lens on a camera. [1/2 definitions] |
| Apollo |
the god of light, music, poetry, and healing in Greek and Roman mythology. Apollo was also the god of prophecy. People travelled to his shrine at Delphi to ask questions about future events. |
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