Source : Webster's Revised Unabridged Dictionary (1913)

Crownwork \Crown"work`\ (-w?rk`), n. (Fort.)
   A work consisting of two or more bastioned fronts, with their
   outworks, covering an enceinte, a bridgehead, etc., and
   connected by wings with the main work or the river bank.

Source : WordNet®

crownwork
     n : dental appliance consisting of an artificial crown for a
         tooth [syn: {cap}]