of or pertaining to birds.

1865–70; avi- + -an

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World English Dictionary
avian (ˈeɪvɪən)
of, relating to, or resembling a bird
[C19: from Latin avis bird]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"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)
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
Bird feeders will attract avian visitors to your garden, for sure.
Yet it's unclear whether this vaccine will work against a more virulent strain
  of avian influenza.
Two new studies identify some of these differences and make startling
  conclusions about what they might mean for avian species.
Contemporary avian and mammalian scavengers aren't exclusively torpid and slow.
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