The Collaborative International Dictionary of English v.0.48:
Latchet \Latch"et\, n. [OE. lachet, from an OF. dialect form of F. lacet plaited string, lace dim. of lacs. See Lace.] The string that fastens a shoe; a shoestring. [1913 Webster]WordNet (r) 3.0 (2006):
latchet n 1: a leather strap or thong used to attach a sandal or shoe to the foot