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See more synonyms for pinna on Thesaurus.com
noun, plural pin·nae [pin-ee] /ˈpɪn i/, pin·nas.
  1. Botany. one of the primary divisions of a pinnate leaf.
  2. Zoology.
    1. a feather, wing, or winglike part.
    2. a fin or flipper.
  3. Anatomy. auricle(def 1a).
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Origin of pinna

1660–70; < Latin: feather, wing, fin
Related formspin·nal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for pinna

Historical Examples

  • Pinna bullata, Swainson (Fig. 168), is also a well-known species.

    The Ocean World:

    Louis Figuier

  • Gloves have been made from the byssal fibers of Pinna mixed with silk.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • They are found in an oyster which is something like the pinna, only less.

  • Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf.

  • It inclines the pinna outwards; it is, accordingly, an abductor of the pinna.

British Dictionary definitions for pinna


noun plural -nae (-niː) or -nas
  1. any leaflet of a pinnate compound leaf
  2. zoology a feather, wing, fin, or similarly shaped part
  3. another name for auricle (def. 2)
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Word Origin

C18: via New Latin from Latin: wing, feather, fin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

pinna in Medicine


n. pl. pin•nae (pĭnē)
  1. auricle
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Related formspinnal adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

pinna in Science


Plural pinnae (pĭnē) pinnas
  1. A leaflet or primary division of a pinnately compound leaf, especially of a fern frond.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.