Bioluminescence Definition

bīō-lo͝omə-nĕsəns
noun
The emission of visible light by certain living organisms, such as the firefly and various fish, marine invertebrates, fungi, and bacteria. Bioluminescence is caused by chemical reactions.
American Heritage
The production of light by living organisms, as by fireflies or many deep-water cephalopods.
Webster's New World
Such light.
Webster's New World

(biology, biochemistry) The emission of light by a living organism (such as a firefly).

Wiktionary
other
The emission of light by living organisms, such as fireflies, glowworms, and certain fish, jellyfish, plankton, fungi, and bacteria. It occurs when a pigment (usually luciferin) is oxidized without giving off heat. Although it is believed that bioluminescence is involved in animal communication, its function in many organisms has yet to be understood. Bioluminescence is a form of chemiluminescence.
American Heritage Science
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Origin of Bioluminescence

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