the measure around anything; circumference.
a band that passes underneath a horse or other animal to hold a saddle in place, especially one having a buckle at each end for fastening to straps running from under the flaps of the saddle. See illus. under saddle.
something that encircles; a band or girdle.
verb (used with object)
to bind or fasten with a girth.
to girdle; encircle.
Also, girt.

1300–50; Middle English girth, gerth < Old Norse gerth girdle; akin to gird1

undergirth, noun
ungirthed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
girth (ɡɜːθ)
1.  the distance around something; circumference
2.  size or bulk: a man of great girth
3.  a band around a horse's belly to keep the saddle in position
4.  (usually foll by up) to fasten a girth on (a horse)
5.  (tr) to encircle or surround
[C14: from Old Norse gjörth belt; related to Gothic gairdagirdle1; see gird1]

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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Word Origin & History

c.1300, "belt around a horse's body," from O.N. gjorð "girdle, belt, hoop," from P.Gmc. *gertu- (cf Goth. gairda "girdle"), from the same source as gird (q.v.). Sense of "measurement around an object" first recorded 1644.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In fact, he notes, the girth of the water pipes allows smokers to take bigger
  puffs than on cigarettes.
Amazon horned frogs achieve their enormous girth by being generally
  indiscriminate about what they eat.
Easy sleep is a distant memory now that she must contend with tens of pounds of
  extra girth.
Streamline fatties by shaving off some girth with a vegetable peeler.
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