In-clū'să, n. pl.

n. pl. [From Lat. includere, inclusum, to shut in.] (Zoöl.) A tribe of shell-bearing acephalous mollusks, characterized by the closed state of the mantle which surrounds and envelops the body, and remarkable for their power of burrowing in and excavating clay, wood, or even stony rocks. The tribe includes the ship-borer (Teredo navalis). Brande.