The Collaborative International Dictionary of English v.0.48:

Holophytic \Hol`o*phyt"ic\, a. [Holo + Gr.? a plant.]
   Wholly or distinctively vegetable.
   [1913 Webster]

   Holophytic nutrition, that form of nutrition,
      characteristic of vegetable organisms, in which carbonic
      acid, ammonia, and nitrates are absorbed as food, in
      distinction from the animal mode of nutrition, by the
      ingestion of albuminous matter.
      [1913 Webster]

WordNet (r) 3.0 (2006):

holophytic
    adj 1: obtaining nourishment as green plants do [ant:
           holozoic]