The Collaborative International Dictionary of English v.0.48:

Lopper \Lop"per\, n.
   One who lops or cuts off.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lopper \Lop"per\, v. i. [imp. & p. p. Loppered; p. pr. & vb.
   n. Loppering.] [Cf. Prov. G. l["u]bbern, levern, OHG.
   giliber[=o]n, G. luppe, lab, rennet.]
   To turn sour and coagulate from too long standing, as milk.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lopper
    n 1: a long-handled pruning saw with a curved blade at the end
         and sometimes a clipper; used to prune small trees [syn:
         pruner, pruning hook, lopper]