This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One of the leading divisions of invertebrated animals; an extensive series of invertebrates whose bodies are soft, without any jointed legs, and commonly covered with a hard shell in one, two, or more pieces, and whose principal parts are neither segmented into a series of longitudinal rings, as in insects, crustaceans, and worms, nor radiately arranged, as in echinoderms; the mollusks, as the univalve or bivalve shell-fish of ordinary language.

n. gastropods; bivalves; cephalopods; chitons

"In the animal kingdom, the mollusca are the rasorial type, which, however, only shews itself there in their soft and sluggish character, and their being very generally edible."

phylum   

Mollusca   

arthropoda    Lepidoptera    crustacea    turbojet    shellfish