The Collaborative International Dictionary of English v.0.48:
Cleaver \Cleav"er\, n. One who cleaves, or that which cleaves; especially, a butcher's instrument for cutting animal bodies into joints or pieces. [1913 Webster]WordNet (r) 3.0 (2006):
cleaver n 1: a butcher's knife having a large square blade [syn: cleaver, meat cleaver, chopper]