The Collaborative International Dictionary of English v.0.48:

matchet \matchet\ n.
   a large heavy knife used in Central and South America as a
   weapon or for cutting vegetation; usually called machete.

   Syn: machete, panga.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

matchet
    n 1: a large heavy knife used in Central and South America as a
         weapon or for cutting vegetation [syn: machete,
         matchet, panga]