Noun

(en noun)

The distance measured around an object.

A band passed under the belly of an animal to hold various types of saddles in place.

* '>citation

The part of an animal around which the girth fits.

(informal) One's waistline circumference, most often a large one.

* Addison

He's a lusty, jolly fellow, that lives well, at least three yards in the girth .

A small horizontal brace or girder.

Noun

(en noun)

The emotion usually following humour and accompanied by laughter; merriment; jollity; gaiety.

* 1883 ,

And he began to laugh again, and that so heartily, that, though I did not see the joke as he did, I was again obliged to join him in his mirth.

*, title=The Mirror and the Lamp

, chapter=2 citation , passage=She was a fat, round little woman, richly apparelled in velvet and lace, […]; and the way she laughed, cackling like a hen, the way she talked to the waiters and the maid, […]—all these unexpected phenomena impelled one to hysterical mirth , and made one class her with such immortally ludicrous types as Ally Sloper, the Widow Twankey, or Miss Moucher.}}

* 1912 , :

Their eyes met and they began to laugh. They laughed as children do when they cannot contain themselves, and can not explain the cause of their mirth to grown people, but share it perfectly together.

That which causes merriment.

* 1922 ,

Phantasmal mirth , folded away: muskperfumed.