The Collaborative International Dictionary of English v.0.48:

Nutritious \Nu*tri"tious\, a. [L. nutricius, nutritius, from
   nutrix, -icis, a nurse, nutrire to nourish. See Nurse,
   Nourish.]
   Nourishing; promoting growth, or preventing decay; alimental.
   -- Nu*tri"tious*ly, adv. -- Nu*tri"tious*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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