The Collaborative International Dictionary of English v.0.48:

Nourish \Nour"ish\, v. i.
   1. To promote growth; to furnish nutriment.
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            Grains and roots nourish more than their leaves.
                                                  --Bacon.
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   2. To gain nourishment. [R.] --Bacon.
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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.]
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   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:

Nourish \Nour"ish\, n.
   A nurse. [Obs.] --Hoolland.
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WordNet (r) 3.0 (2006):

nourish
    v 1: provide with nourishment; "We sustained ourselves on bread
         and water"; "This kind of food is not nourishing for young
         children" [syn: nourish, nurture, sustain]
    2: give nourishment to [syn: nutrify, aliment, nourish]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "nourish":
   abet, advance, aid, aid and abet, aliment, ask for, breast-feed,
   care for, cherish, coddle, cosset, countenance, cradle, cultivate,
   dry-nurse, encourage, fatten, fatten up, feed, fondle, force-feed,
   fortify, foster, give encouragement, harbor, help, invite, keep,
   keep in countenance, lactate, lavish care on, look after, maintain,
   mother, nurse, nurture, nutrify, pamper, promote, provide for,
   spoon-feed, stimulate, strengthen, stuff, suckle, support, sustain,
   take care of, wet-nurse