Pallial a. : Of or pretaining to a mantle, especially to the mantle of mollusks; produced by the mantle; as, the pallial line, or impression, which marks the attachment of the mantle on the inner surface of a bivalve shell. See Illust. of Bivalve.

Example:
Are there aveolies in gastropods?

Taxonomy
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Defination from the web:
pallial in the Online Dictionary. Meaning of pallial. Pronunciation of pallial. Translations of pallial. pallial synonyms, pallial antonyms. ... pallial. Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson. 0.10 sec. pal·li·al (pl-l) adj. 1. Relating to the cerebral cortex. ...