The Collaborative International Dictionary of English v.0.48:

Pollard \Pol"lard\, v. t. [imp. & p. p. Pollarded; p. pr. &
   vb. n. Pollarding.]
   To lop the tops of, as trees; to poll; as, to pollard
   willows. --Evelyn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pollard \Pol"lard\, n. [From Poll the head.]
   1. A tree having its top cut off at some height above the
      ground, that may throw out branches. --Pennant.
      [1913 Webster]

   2. A clipped coin; also, a counterfeit. [Obs.] --Camden.
      [1913 Webster]

   3. (Zool.)
      (a) A fish, the chub.
      (b) A stag that has cast its antlers.
      (c) A hornless animal (cow or sheep).
          [1913 Webster]

WordNet (r) 3.0 (2006):

pollard
    n 1: a tree with limbs cut back to promote a more bushy growth
         of foliage
    2: a usually horned animal that has either shed its horns or had
       them removed
    v 1: convert into a pollard; "pollard trees" [syn: poll,
         pollard]