Jess, n. [OF. gies, giez, prop. pl. of giet, get, jet, F. jet, a throwing, jess. See Jet a shooting forth.].
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. [1913 Webster]
"Like a hawk, which feeling freed From bells and jesses which did let her flight."
[1913 Webster]