Definitions

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

  • noun A toxin, C44H68O13, produced by dinoflagellates and found in certain edible mollusks that consume them. It can cause diarrhea and other gastrointestinal symptoms in humans.

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

  • noun A toxin that accumulates in bivalves and causes diarrhetic shellfish poisoning.

Etymologies

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

[(Halichondria) okadai, species name of the marine sponge from which it was first isolated (after Yaichiro K. Okada, (1892–1976), Japanese zoologist) + –ic.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

After the marine sponge Halichondria okadai, from which it was first isolated.

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