box \box\ bo^ks, n. as. box, l. buxus, fr. gr. ?. see box
   a case. bot.
   a tree or shrub, flourishing in different parts of the world.
   the common box buxus sempervirens has two varieties, one
   of which, the dwarf box buxus suffruticosa, is much used
   for borders in gardens. the wood of the tree varieties, being
   very hard and smooth, is extensively used in the arts, as by
   turners, engravers, mathematical instrument makers, etc.
   1913 webster

   box elder, the ash-leaved maple negundo aceroides, of
      north america.

   box holly, the butcher's broom russus aculeatus.

   box thorn, a shrub lycium barbarum.

   box tree, the tree variety of the common box.
      1913 webster
see also:
box buxus sempervirens buxus suffruticosa box elder negundo aceroides box holly 
russus aculeatus box thorn lycium barbarum box tree