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The Collaborative International Dictionary
Mytiloid

Mytiloid \Myt"i*loid\, a. [Mytilus + -oid.] (Zo["o]l.) Like, or pertaining to, the genus Mytilus, or family Mytilid[ae].

Wiktionary
mytiloid

a. (context zoology English) Resembling or relating to the genus ''Mytilus'' or family Mytilidae.