[ pin-uh ]
/ ˈpɪn ə /

noun, plural pin·nae [pin-ee] /ˈpɪn i/, pin·nas.

Botany. one of the primary divisions of a pinnate leaf.
  1. a feather, wing, or winglike part.
  2. a fin or flipper.
Anatomy. auricle(def 1a).

Nearby words

  1. pinko,
  2. pinkroot,
  3. pinkster,
  4. pinky,
  5. pinky bar,
  6. pinnace,
  7. pinnacle,
  8. pinnae,
  9. pinnate,
  10. pinnately

Origin of pinna

1660–70; < Latin: feather, wing, fin

Related formspin·nal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pinnae

British Dictionary definitions for pinnae


/ (ˈpɪnə) /

noun plural -nae (-niː) or -nas

any leaflet of a pinnate compound leaf
zoology a feather, wing, fin, or similarly shaped part
another name for auricle (def. 2)

Word Origin for pinna

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

Medicine definitions for pinnae


[ pĭnə ]

n. pl. pin•nae (pĭnē)

Related formspinnal adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for pinnae


[ pĭnə ]

Plural pinnae (pĭnē) pinnas

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