Aperient

from WordNet (r) 3.0 (2006)

aperient
    adj 1: mildly laxative
    n 1: a purging medicine; stimulates evacuation of the bowels
         [syn: {purgative}, {cathartic}, {physic}, {aperient}]

from The Collaborative International Dictionary of English v.0.48

Aperient \A*pe"ri*ent\, a. [L. aperiens, p. pr. of aperire to
   uncover, open; ab + parire, parere, to bring forth, produce.
   Cf. {Cover}, {Overt}.] (Med.)
   Gently opening the bowels; laxative. -- n. An aperient
   medicine or food. --Arbuthnot.
   [1913 Webster]