Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A red carotenoid pigment, C40H52O4, produced by certain bacteria, fungi, and green algae and found in wild salmon, trout, and some crustaceans. It is used in animal feed to impart color and as an antioxidant.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun organic chemistry A xanthophyll pigment that occurs widely in plants and animals, especially crustaceans.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Astacus, former genus name of Homarus gammarus, the species of lobster from which the pigment was first extracted (from Latin astacus, lobster, from Greek astakos, variant of ostakos; see ost- in Indo-European roots) + xanth(o)– + –in.]

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