The Collaborative International Dictionary of English v.0.48:
Excretory \Ex*cre"to*ry\, a. [Cf. F. excr['e]toire.] Having the quality of excreting, or throwing off excrementitious matter. [1913 Webster]WordNet (r) 3.0 (2006):
excretory adj 1: of or relating to the process of excretion