What is "jesses"

Jess \Jess\, n.; pl. Jesses. [OF. gies, giez, prop. pl. of giet, get, jet, F. jet, a throwing, jess. See Jet a shooting forth.] (falconry) A short strap of leather or silk secured round the leg of a hawk, to which the leash or line, wrapped round the falconer's hand, was attached when used. See Illust. of Falcon.

Like a hawk, which feeling freed From bells and jesses which did let her flight.
--Spenser.

n. (plural of jess English) vb. (en-third-person singular of: jess)