Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Botany A leaflet or primary division of a pinnately compound leaf.
  • n. Zoology A feather, wing, fin, or similar appendage.
  • n. Anatomy See auricle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The visible part of the ear that resides outside of the head, the auricle.
  • n. A leaflet or primary segment of a pinnate compound leaf.
  • n. A feather, wing, fin, or other similar appendage.

from the GNU version of the Collaborative International Dictionary of English

  • n.
  • n. A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under bipinnate.
  • n. One of the primary divisions of a decompound leaf.
  • n. One of the divisions of a pinnate part or organ.
  • n. 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.
  • n. The auricle of the ear. See Ear.

from The Century Dictionary and Cyclopedia

  • n. In anat. and zoöl.:
  • n. A feather. See penna.
  • n. A bird's wing. See pinion.
  • n. A fish's fin: the usual technical name.
  • n. Some wing-like or fin-like part or organ, as the flipper of a seal or cetacean.
  • n. The outer ear, which projects from the head; the auricle, or pavilion of the ear. See cut under ear.
  • n. The nostril, or wing of the nose.
  • n. One of the smaller branches of some polyps, as plumularians.
  • n. In entomology, a small oblique ridge forming one of the lines of a pinnate surface. See pinnate.
  • n. In botany, one of the primary divisions of a pinnate leaf: applied most commonly to ferns.
  • n. the alæ nasi; the nostrils.
  • n. A genus of bivalves, typical of the family Pinnidæ.
  • n. [l. c] A bivalve mollusk of the genus Pinna.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the externally visible cartilaginous structure of the external ear
  • n. division of a usually pinnately divided leaf

Etymologies

Latin, feather; see pet- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • “And after all, didn’t somebody just make up the word pinna, too?”

    Frindle

  • In the pinna also is found the so-called pinna-guard.

    The History of Animals

  • The external ear consists of an expanded portion known as the pinna or _auricle_, and of a passage, the auditory canal or _meatus_, leading inwards from it.

    A Practical Physiology

  • Normally, the outer ear, known as the pinna, collects sound waves and directs them into the ear canal, which carries the sound waves to the eardrum.

    The New Yorker

  • "The pinna is a variety of shell-fish not unlike the mussel; it fastens itself to the rocks and from between its shells gives out threads something like those of the spider or silkworm.

    The Story of Silk

  • By contrast, the Atomic Floyd HiDefjaxes are shaped so they nestle snugly into your ears, and stay there: they've got a curve in the shape of the earpieces that wedges them in your pinna.

    Review: Blackbox i10 noise-cancelling headphones, Atomic Floyd MiniDart headphones + mic

  • The external ear is also called the auricula or pinna.

    Archive 2009-06-01

  • With a graceful gesture she swept the tresses framing her right cheek behind a delicate ear, revealing that the pinna contained two openings to the auditory canal, one in the center, and a smaller one near the upper edge.

    Star Trek: Voyager®: Full Circle

  • In most dogs, the pinna—the outer, visible part of the ear—rotates to better open a channel from the sound source to the inner ear.

    INSIDE OF A DOG

  • She had a steel bar through the top of her ear, through her pinna, which was a useful Scrabble word.

    Best Friends Forever

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