The Collaborative International Dictionary of English v.0.48:

Nourish \Nour"ish\ (n[u^]r"[i^]sh), v. t. [imp. & p. p.
   Nourished (n[u^]r"[i^]sht); p. pr. & vb. n. Nourishing.]
   [OE. norisen, norischen, OF. nurir, nurrir, norir, F.
   nourrir, fr. L. nutrire. Cf. Nurse, Nutriment, and see
   -ish.]
   [1913 Webster]
   1. To feed and cause to grow; to supply with matter which
      increases bulk or supplies waste, and promotes health; to
      furnish with nutriment.
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            He planteth an ash, and the rain doth nourish it.
                                                  --Is. xliv.
                                                  14.
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   2. To support; to maintain.
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            Whiles I in Ireland nourish a mighty band. --Shak.
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   3. To supply the means of support and increase to; to
      encourage; to foster; as, to nourish rebellion; to nourish
      the virtues. "Nourish their contentions." --Hooker.
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   4. To cherish; to comfort.
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            Ye have nourished your hearts.        --James v. 5.
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   5. To educate; to instruct; to bring up; to nurture; to
      promote the growth of in attainments. --Chaucer.
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            Nourished up in the words of faith.   --1 Tim. iv.
                                                  6.
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   Syn: To cherish; feed; supply. See Nurture.
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The Collaborative International Dictionary of English v.0.48:

Nourishing \Nour"ish*ing\, a.
   Promoting growth; nutritious.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "nourishing":
   alimental, alimentary, assimilable, cannibal, cannibalistic,
   carnivorous, commensal, dietetic, digestible, dining, eating,
   feeding, flesh-eating, fruitarian, gastronomic, gluttonous,
   grain-eating, graminivorous, granivorous, grass-eating,
   herbivorous, insect-eating, insectivorous, lactovegetarian,
   man-eating, meat-eating, mensal, nutrient, nutritious, nutritive,
   omnivorous, omophagous, pantophagous, phytivorous, phytophagous,
   plant-eating, postprandial, prandial, predacious, preprandial,
   vegetable-eating, vegetarian