- 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.
Meaning of 'crownwork' (Princeton's WordNet)
1 . crownwork
[ n]
Meaning (1): - (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth