pinna Meaning, Definition & Usage

  1. noun division of a usually pinnately divided leaf
    pinnule.
  2. noun the externally visible cartilaginous structure of the external ear
    ear; auricle.

WordNet

Pin"na noun
Etymology
L., a feather.
Wordforms
plural Pinnæ E Pinnas
Definitions
  1. (Bot.) (a) A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under Bipinnate. (b) One of the primary divisions of a decompound leaf.
  2. (Zoöl.) One of the divisions of a pinnate part or organ.
  3. L. pinna, akin to Gr. . (Zoöl.) 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.
  4. (Anat.) The auricle of the ear. See Ear.

Webster 1913