bi·o·lu·mi·nes·cence 
(bī′ō-l′mə-nĕsəns)
(bī′ō-l′mə-nĕsəns)n.
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.
bi′o·lu′mi·nescent adj.
bioluminescencebioluminescent ctenophore