From The Collaborative International Dictionary of English v.0.48 [gcide]:
Egest \E*gest"\, v. t. [L. egestus, p. p. of egerere to carry
out, to discharge; e out + gerere to carry.] (Physiol.)
To cast or throw out; to void, as excrement; to excrete, as
the indigestible matter of the food; in an extended sense, to
excrete by the lungs, skin, or kidneys.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
egest
v 1: eliminate from the body; "Pass a kidney stone" [syn:
excrete, egest, eliminate, pass]