The Collaborative International Dictionary of English v.0.48:

Ingest \In*gest"\, v. t. [L. ingenium, p. p. of ingerere to put
   in; pref. in- in + gerere to bear.]
   1. To take into, or as into, the stomach or alimentary canal.
      --Sir T. Browne.
      [1913 Webster]

   2. To take into the body by any means, as by inhalation,
      injection, absorption, as well as through the mouth.
      [PJC]

WordNet (r) 3.0 (2006):

ingest
    v 1: serve oneself to, or consume regularly; "Have another bowl
         of chicken soup!"; "I don't take sugar in my coffee" [syn:
         consume, ingest, take in, take, have] [ant:
         abstain, desist, refrain]
    2: take up mentally; "he absorbed the knowledge or beliefs of
       his tribe" [syn: absorb, assimilate, ingest, take in]