The Collaborative International Dictionary of English v.0.48:
Sacrificial \Sac`ri*fi"cial\, a. Of or pertaining to sacrifice or sacrifices; consisting in sacrifice; performing sacrifice. "Sacrificial rites." --Jer. Taylor. [1913 Webster]WordNet (r) 3.0 (2006):
sacrificial adj 1: used in or connected with a sacrifice; "sacrificial lamb"