Gambrel n. : The hind leg of a horse.

Gambrel n. : A stick crooked like a horse's hind leg; -- used by butchers in suspending slaughtered animals.

Gambrel v. t. : To truss or hang up by means of a gambrel.

Example:
How good are the acoustics of a Gambrel roof barn?

Taxonomy
Gambrel, gambrel roof, roof, Mansard roof, pitch, gambrel roofs, free encyclopedia, roof style, gable end, the French, hip roof, in America, hind leg, ridge, stick, upright, post truss, eave.

Defination from the web:
Gambrel is a stick or piece of timber used to spread open and ... 1765 Massachusetts Gazette "A large building with two upright stories and a Gambrel Roof. ...