The Collaborative International Dictionary of English v.0.48:

Prune \Prune\, v. t. [imp. & p. p. Pruned; p. pr. & vb. n.
   Pruning.] [OE. proine, probably fr. F. provigner to lay
   down vine stocks for propagation; hence, probably, the
   meaning, to cut away superfluous shoots. See Provine.]
   1. To lop or cut off the superfluous parts, branches, or
      shoots of; to clear of useless material; to shape or
      smooth by trimming; to trim: as, to prune trees; to prune
      an essay. --Thackeray.
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            Taking into consideration how they [laws] are to be
            pruned and reformed.                  --Bacon.
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            Our delightful task
            To prune these growing plants, and tend these
            flowers.                              --Milton.
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   2. To cut off or cut out, as useless parts.
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            Horace will our superfluous branches prune.
                                                  --Waller.
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   3. To preen; to prepare; to dress. --Spenser.
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            His royal bird
            Prunes the immortal wing and cloys his beak. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Prune \Prune\, v. i.
   To dress; to prink; -used humorously or in contempt.
   --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Prune \Prune\, n. [F. prune, from L. prunum a plum. See Plum.]
   A plum; esp., a dried plum, used in cookery; as, French or
   Turkish prunes; California prunes.
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   German prune (Bot.), a large dark purple plum, of oval
      shape, often one-sided. It is much used for preserving,
      either dried or in sirup.

   Prune tree. (Bot.)
   (a) A tree of the genus Prunus (Prunus domestica), which
       produces prunes.
   (b) The West Indian tree, Prunus occidentalis.

   South African prune (Bot.), the edible fruit of a
      sapindaceous tree (Pappea Capensis).
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WordNet (r) 3.0 (2006):

prune
    n 1: dried plum
    v 1: cultivate, tend, and cut back the growth of; "dress the
         plants in the garden" [syn: snip, clip, crop, trim,
         lop, dress, prune, cut back]
    2: weed out unwanted or unnecessary things; "We had to lose
       weight, so we cut the sugar from our diet" [syn: cut,
       prune, rationalize, rationalise]