From The Collaborative International Dictionary of English v.0.48:

Pruner \Prun"er\, n.
   1. One who prunes, or removes, what is superfluous.
      [1913 Webster]

   2. (Zool.) Any one of several species of beetles whose
      larv[ae] gnaw the branches of trees so as to cause them to
      fall, especially the American oak pruner ({Asemum
      m[oe]stum}), whose larva eats the pith of oak branches,
      and when mature gnaws a circular furrow on the inside
      nearly to the bark. When the branches fall each contains a
      [1913 Webster]
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