limelight

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limelight:

see calcium oxidecalcium oxide,
chemical compound, CaO, a colorless, cubic crystalline or white amorphous substance. It is also called lime, quicklime, or caustic lime, but commercial lime often contains impurities, e.g., silica, iron, alumina, and magnesia.
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limelight

[′līm‚līt]
(engineering)
A light source once used in spotlights; it consisted of a block of lime heated to incandescence by means of an oxyhydrogen flame torch.

limelight

a. a type of lamp, formerly used in stage lighting, in which light is produced by heating lime to white heat
b. brilliant white light produced in this way
References in periodicals archive ?
Solar activity in calcium light can be especially strong around the time of solar minimum.
Swain has made a Faustian bargain that includes self-mutilation and drug trafficking to prolong his time in front of the calcium lights.
Large calcium lights set up along Executive Avenue made the scene "as light as day," according to the Chicago Tribune.