GIRTH

[noun] - the distance around the outside of a thick or fat object, like a tree or a body; circumferencea tree of massive girth [U]large in girth [U]The oak measured 2 metres round the/its girth. [C](humorous) His ample girth (= fatness) was evidence of his love of good food. [C]The girth is also the strap which goes around the middle of a horse to keep the rider's seat or the load in the right position.Loosen the girth a little.