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