a·pe·ri·ent 
(ə-pîrē-ənt)
(ə-pîrē-ənt)adj.
Gently stimulating evacuation of the bowels; laxative.
n.
A mild laxative.
[Latin aperiēns, aperient-, present participle of aperīre, to open; see wer-4 in the Appendix of Indo-European roots.]
a·peri·ent n.