a·vi·an

[ey-vee-uhn]
adjective
of or pertaining to birds.

Origin:
1865–70; avi- + -an

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
avian (ˈeɪvɪən) [Click for IPA pronunciation guide]
 
adj
of, relating to, or resembling a bird
 
[C19: from Latin avis bird]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Avian is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

avian
"pertaining to birds," 1870; see aviary.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

avian a·vi·an (ā'vē-ən)
adj.
Of, relating to, or characteristic of birds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
avian   (ā'vē-ən)  Pronunciation Key 
Relating to birds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Avian and human viruses recognize and attach themselves to different sugar
  structures.
But that symbiosis is complicating efforts to control the nation's outbreaks of
  avian flu.
The brain, avian or human, does something similar naturally.
The list represents a variety of avian lifestyles-and a mix of reasons why oil
  would reach the birds.
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