o·be·si·ty

[oh-bee-si-tee]
noun
the condition of being very fat or overweight; corpulence: His obesity puts him at risk for major health problems.
Sometimes, o·bese·ness.

an·ti·o·be·si·ty, adjective, noun, plural an·ti·o·be·si·ties.
o·ver·o·be·si·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
obese (əʊˈbiːs) [Click for IPA pronunciation guide]
 
adj
excessively fat or fleshy; corpulent
 
[C17: from Latin obēsus, from ob- (intensive) + edere to eat]
 
o'besity
 
n
 
o'beseness
 
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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00:10
Obesity is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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

obesity
1610s, from Fr. obésité, from L. obesitas "fatness, corpulence," from obesus "that has eaten itself fat," pp. of obdere "to eat all over, devour," from ob "over" + edere "eat" (see edible).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

obesity o·be·si·ty (ō-bē'sĭ-tē)
n.
The condition of being obese; increased body weight caused by excessive accumulation of fat.

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
obesity   (ō-bē'sĭ-tē)  Pronunciation Key 
The condition of being obese; increased body weight caused by excessive accumulation of fat.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Past studies have found links between psoriasis and both obesity and heavy
  drinking.
As the obesity epidemic accelerates, more researchers are looking to prenatal
  risk factors.
Researchers says the link between obesity and more severe swine flu may be
  explained by physical pressure on the lungs.
The symptom of metabolic syndrome that appears first is usually obesity, so
  this is generally regarded as the underlying cause.
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