- Botany. one of the primary divisions of a pinnate leaf.
- a feather, wing, or winglike part.
- a fin or flipper.
- Anatomy. auricle(def 1a).
Origin of pinna
1660–70; < Latin: feather, wing, fin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pinna
Pinna bullata, Swainson (Fig. 168), is also a well-known species.The Ocean World:
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.The Elements of Botany
It inclines the pinna outwards; it is, accordingly, an abductor of the pinna.Artistic Anatomy of Animals
- any leaflet of a pinnate compound leaf
- zoology a feather, wing, fin, or similarly shaped part
- another name for auricle (def. 2)
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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.