The Collaborative International Dictionary of English v.0.48:

Dahoon \Da*hoon"\ (d[.a]*h[=oo]n"), [Origin unknown.]
   An evergreen shrub or small tree (Ilex cassine) of the
   southern United States, bearing red drupes and having soft,
   white, close-grained wood; -- called also dahoon holly.
   [Webster 1913 Suppl.]