Etymology
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girth (n.)

c. 1300, "belt around a horse's body," from Old Norse gjorð "girdle, belt, hoop," from Proto-Germanic *gertu- (cf Gothic gairda "girdle"), from the same source as girdle and gird. Sense of "measurement around an object" first recorded 1640s.

updated on March 05, 2015

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Definitions of girth from WordNet
1
girth (n.)
the distance around a person's body;
girth (n.)
stable gear consisting of a band around a horse's belly that holds the saddle in place;
Synonyms: cinch
2
girth (v.)
tie a cinch around;
Synonyms: cinch
From wordnet.princeton.edu, not affiliated with etymonline.