or·ni·thol·o·gy

[awr-nuh-thol-uh-jee]
noun
the branch of zoology that deals with birds.

Origin:
1645–55; < Neo-Latin ornithologia. See ornitho-, -logy

or·ni·tho·log·i·cal [awr-nuh-thuh-loj-i-kuhl] , or·ni·tho·log·ic, adjective
or·ni·tho·log·i·cal·ly, adverb
or·ni·thol·o·gist, noun
un·or·ni·tho·log·i·cal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
ornithology (ˌɔːnɪˈθɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the study of birds, including their physiology, classification, ecology, and behaviour
 
ornithological
 
adj
 
ornitho'logically
 
adv
 
orni'thologist
 
n

00:10
Ornithologist is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
ornithology (ˌɔːnɪˈθɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the study of birds, including their physiology, classification, ecology, and behaviour
 
ornithological
 
adj
 
ornitho'logically
 
adv
 
orni'thologist
 
n

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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Etymonline
Word Origin & History

ornithologist
1670s, from Mod.L. ornithologia (1599), from Gk. ornitho- (q.v.) + -logia "study," from logos "word."

ornithology
1670s, from Mod.L. ornithologia (1590s), from Gk. ornithologos, from ornitho- (q.v.) + -logia "study."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ornithology   (ôr'nə-thŏl'ə-jē)  Pronunciation Key 
The scientific study of birds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Few, if any, other tools available to the ornithologist have been as productive.
It is a five-day journey with a group of up to eight people led by an
  experienced ornithologist guide.
The same specimens sometimes served the great ornithologist as models and meals.
The surveying ornithologist shall inspect all trees in and immediately adjacent
  to the subject area for raptor nests.
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