The Collaborative International Dictionary of English v.0.48:

Leatherwood \Leath"er*wood`\, n. (Bot.)
   A small branching shrub (Dirca palustris), with a white,
   soft wood, and a tough, leathery bark, common in damp woods
   in the Northern United States; -- called also moosewood,
   and wicopy. --Gray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Dirca palustris
    n 1: deciduous shrub of eastern North America having tough
         flexible branches and pliable bark and small yellow flowers
         [syn: leatherwood, moosewood, moose-wood, wicopy,
         ropebark, Dirca palustris]