noun, plural pinnae [pin-ee] , pinnas.
Botany. one of the primary divisions of a pinnate leaf.
a feather, wing, or winglike part.
a fin or flipper.
Anatomy, auricle ( def 1a ).

1660–70; < Latin: feather, wing, fin

pinnal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To pinna
World English Dictionary
pinna (ˈpɪnə)
n , pl -nae, -nas
1.  any leaflet of a pinnate compound leaf
2.  zoology a feather, wing, fin, or similarly shaped part
3.  another name for auricle
[C18: via New Latin from Latin: wing, feather, fin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Medical Dictionary

pinna pin·na (pĭn'ə)
n. pl. pin·nae (pĭn'ē)
See auricle.

pin'nal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
pinna   (pĭn'ə)  Pronunciation Key 
Plural pinnae (pĭn'ē) or pinnas
A leaflet or primary division of a pinnately compound leaf, especially of a fern frond.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Encyclopedia Britannica


in human anatomy, the visible portion of the external ear, and the point of difference between the human ear and that of other mammals. The auricle in humans is almost rudimentary and generally immobile and lies close to the side of the head. It is composed of a thin plate of yellow fibrocartilage covered by a tight-fitting skin. The external ear cartilage is molded into shape and has well-defined hollows, furrows, and ridges that form an irregular shallow funnel. The deepest depression in the auricle, called the concha, leads to the external auditory canal or meatus. The one portion of the auricle that has no cartilage is the lobule-the fleshy lower part of the auricle. The auricle has several small basic muscles that connect it to the skull and scalp. Generally nonfunctional in human beings, they are capable of limited movement in some people

Learn more about pinna with a free trial on

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
Fits perfectly in ear despite lack of pinna-anchoring loops.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature