I. ˈgərth noun
Etymology: Middle English, from Old Norse gjǫrth; akin to Old English gyrdan to gird
Date: 13th century
1. : a band or strap that encircles the body of an animal to fasten something (as a saddle) on its back
2.
a. : a measure around a body
a man of more than average girth
the girth of a tree
b. : size , dimensions
II. transitive verb
Date: 15th century
1. : encircle
2. : to bind or fasten with a girth
3. : to measure the girth of