1) Animal pigment 2) Biological pigment 
in biochemistry, any of several organic compounds whose oxidation in the presence of the enzyme luciferase produces light. Luciferins vary in ... [3 related articles]
<protein> Substrate for the enzyme luciferase that catalyses an oxidative reaction leading to photon emission (bioluminescence). ... (18 Nov 1997) ... 
compound whose activated form emits light.
[n] - pigment occurring in luminescent organisms (as fireflies)
luciferin 1. A substance found in the cells of bioluminescent organisms; such as, glowworms and fireflies, that on oxidation emits bluish-green light with very little heat. 2. Any of several substances involved in the emission of light by a living organism. Luciferins are chemically diverse, depending on the organism. They are oxidized enzymicall...
noun pigment occurring in luminescent organisms (as fireflies); emits heatless light when undergoing oxidation
an organic substance that is used by organisms such as fireflies to help produce light without heat
a pigment occurring in luminescent organisms, as fireflies, that emits light when undergoing oxidation.