Lewis & Short

pinnŭla, ae, f. dim. [1. pinna], a little plume or wing.

  1. I. Lit., Plaut. Am. prol. 143; Col. 8, 5.
  2. II. Transf., a little fin, a fin, Plin. 9, 57, 83, § 175; Vulg. Lev. 11, 9; id. Deut. 14, 9.