A light-producing organ in certain fishes and other animals.
- Eyelightfish have a blunt snout, a large upturned mouth, a deeply forked caudal fin, and a light-emitting organ, called a photophore, under each eye.
- Deep sea fish have organs called photophores which create a center for the bioluminescent reactions.
- Some, like fireflies, produce light in special organs called photophores.
Late 19th century: from Greek phōtophoros 'light-bearing'.
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