Definition of "jiggot"

A jiggot of mutton is the leg with part of the loin; provide ſuch a one as has been killed two or three days at leaſt, thump it well, and bind it with packthread; […]

1759, William Verral, “Jigot de mouton aux onions Espaniols. Jiggot of Mutton with Spanish Onions.”, in A Complete System of Cookery. […], London: Printed for the author, and sold by him; as also by Edward Verral bookseller, […]; and by John Rivington […], page 47