
1) Cap
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https://www.crosswordclues.com/clue/crownwork

1) Dental appliance
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https://www.crosswordclues.com/clue/crownwork

A crownwork is an element of the trace italienne system of fortification and is effectively an expanded Hornwork. It consists of a full bastion with the walls on either side ending in half bastions from which longer flank walls run back towards the main fortress.{sfn|Griffiths|1862|p=262} The crownwork was used to extend the fortified area in a pa...
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http://en.wikipedia.org/wiki/Crownwork

• (n.) 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.
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http://thinkexist.com/dictionary/meaning/crownwork/

Freestanding bastioned fortification in front of main defenses.
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http://www.castlesontheweb.com/glossary.html

Freestanding bastioned fortification in front of main defenses.
Found on
http://www.encyclo.co.uk/local/20018

Advanced fortification structure screening the entrance to a bastion fort.
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http://www.encyclo.co.uk/visitor-contributions.php
Crown'work` noun (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.
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http://www.encyclo.co.uk/webster/C/194

[
n] - dental appliance consisting of an artificial crown for a tooth
Found on
http://www.webdictionary.co.uk/definition.php?query=crownwork
noun dental appliance consisting of an artificial crown for a tooth
Found on
https://www.encyclo.co.uk/local/20974

an outwork containing a central bastion with a curtain and demibastions, usually designed to cover some advantageous position.
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https://www.infoplease.com/dictionary/crownwork
No exact match found.