Dictionary.com
Thesaurus.com

crownwork

American  
[kroun-wurk] / ˈkraʊnˌwɜrk /

noun

Fortification.
  1. an outwork containing a central bastion with a curtain and demibastions, usually designed to cover some advantageous position.


crownwork British  
/ ˈkraʊnˌwɜːk /

noun

    1. the manufacture of artificial crowns for teeth

    2. such an artificial crown or crowns

  1. fortifications a covering or protective outwork

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of crownwork

First recorded in 1670–80; crown + work