2. (Zoˆl.) One of the divisions of a pinnate part or organ.

3. [L. pinna, akin to Gr. &?;.] (Zoˆl.) Any species of Pinna, a genus

of large bivalve mollusks found in all warm seas. The byssus consists

of a large number of long, silky fibers, which have been used in

manufacturing woven fabrics, as a curiosity.