The Collaborative International Dictionary of English v.0.48:

Alimentary \Al`i*men"ta*ry\, a. [L. alimentarius, fr. alimentum:
   cf. F. alimentaire.]
   Pertaining to aliment or food, or to the function of
   nutrition; nutritious; alimental; as, alimentary substances.
   [1913 Webster]

   Alimentary canal, the entire channel, extending from the
      mouth to the anus, by which aliments are conveyed through
      the body, and the useless parts ejected.
      [1913 Webster]

WordNet (r) 3.0 (2006):

alimentary
    adj 1: of or providing nourishment; "good nourishing stew" [syn:
           alimentary, alimental, nourishing, nutrient,
           nutritious, nutritive]