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| 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. |
| arctic fox |
a fox of arctic regions, whose fur is blue-gray or brownish gray in summer and white or light gray in winter. |
| areaway |
a sunken area in front of basement doors or windows allowing access from outside, or permitting light and air to pass through. [1/2 definitions] |
| asterism |
a luminous starlike figure that reflected or transmitted light produces in some crystals. [1/2 definitions] |
| astigmatism |
an irregularity in the curvature of a lens, including that of the eye, that prevents rays of light from meeting in a single focal point, resulting in an indistinct or distorted image. [1/2 definitions] |
| aureole |
an encircling region of light, esp. in artistic representations of a god or holy figure, or around an astronomical object such as the moon; halo; corona. |
| Aurora |
(l.c.) bands or streamers of light that appear in the sky at night in areas around the magnetic poles, caused by solar particles striking atoms in the outer part of the earth's atmosphere. (See aurora australis, aurora borealis.) [1/3 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. |
| badminton |
a sport in which players use light, long-handled rackets to propel a shuttlecock back and forth across a high net. |
| baffle |
to obstruct or deflect the movement of (gases, sound waves, light, liquid, or the like). [2/4 definitions] |
| ballad |
a light popular song, often having a romantic theme. [1/2 definitions] |
| balloon |
a bag made of rubber or other light, strong material that may be filled with air or helium and used as a decoration or toy. [1/8 definitions] |
| balsa |
a tree of tropical America, the wood of which is extremely light in weight. [1/2 definitions] |
| banter |
to speak to in a light and playful manner. [1/3 definitions] |
| beacon |
a signal of light that guides or gives warning, often located in an elevated position. [1/7 definitions] |
| beam |
a ray of light, or a group of such rays. [1/8 definitions] |
| beamy |
radiating light; shining. [1/2 definitions] |
| berlin |
(sometimes cap.) a light soft wool yarn used for gloves. [1/2 definitions] |
| beryllium |
a chemical element of the alkaline-earth group that has four protons in each nucleus and occurs in pure form as a hard, light, gray solid, chiefly used in alloys with copper and in aerospace material. (symbol: Be) |
| bioluminescence |
the emission of light produced naturally by certain kinds of insects, fish, or bacteria, or such light itself. |
| birefringence |
the splitting of a light wave into two perpendicular waves that have different speeds, as in some crystals. |
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