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"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "sacrificial":
   atoning, best, bottom, conciliatory, cut, expiatory, giveaway,
   given up, half-price, lowest, marked down, propitiatory, reduced,
   rock-bottom, sacrificed, slashed, surrendered, yielded