
1) Bulwark 2) Castle architecture 3) French word used in English 4) Rampart 5) Wall 
Found on 
https://www.crosswordclues.com/clue/merlon

 A merlon is the solid upright section of a battlement or crenellated parapet in medieval architecture or fortifications. Merlons are sometimes pierced by narrow, vertical embrasures or slits designed for observation and fire. The space between two merlons is called a crenel, and a succession of merlons and crenels is a crenellation. Crenels design...
Found on 
http://en.wikipedia.org/wiki/Merlon

The solid section of a battlement.
Found on 
http://great-castles.com/glossary.php

narrow wall in battlement between embrasures
Found on 
http://phrontistery.info/m.html

• (n.) One of the solid parts of a battlemented parapet; a battlement. See Illust. of Battlement.
Found on 
http://thinkexist.com/dictionary/meaning/merlon/

(from the article `battlement`) the parapet of a wall consisting of alternating low portions known as crenels, or crenelles (hence crenellated walls with battlements), and high ...
Found on 
http://www.britannica.com/eb/a-z/m/74

the 'teeth' of battlements, between the crenels or embrasures. High sections of battlements
Found on 
http://www.castles-of-britain.com/glossary.htm

The high segment of the alternating high and low segments of a battlement.
Found on 
http://www.castlesontheweb.com/glossary.html

The high segment of the alternating high and low segments of a battlement.
Found on 
http://www.encyclo.co.uk/local/20018

solid part of embattled parapet that provided shelter to a defender
Found on 
http://www.encyclo.co.uk/local/22129

The 'tooth' in crenellations, alternating with gaps. see Crenel
Found on 
http://www.encyclo.co.uk/visitor-contributions.php
 Mer'lon  noun
Mer'lon  noun [ French, perhaps from Latin 
 moerus , for 
 murus a wall, through (assumed) dim. 
 moerulus .] 
 (Fort.) One of the solid parts of a battlemented parapet; a battlement. See 
 Illust. of 
 Battlement . 
Found on 
http://www.encyclo.co.uk/webster/M/50

In fortifications a merlon is one of the solid parts of a battlemented parapet; a battlement.
Found on 
http://www.probertencyclopaedia.com/browse/FM.HTM

In architecture, a merlon is the solid piece of a battlement, between two embrasures.
Found on 
http://www.probertencyclopaedia.com/browse/TM.HTM

[
n] - a solid section between two crenels in a crenelated battlement
Found on 
http://www.webdictionary.co.uk/definition.php?query=merlon

solid part of embattled parapet that provided shelter to a defender
Found on 
https://www.encyclo.co.uk/local/20402
 noun
 noun a solid section between two crenels in a crenelated battlement
Found on 
https://www.encyclo.co.uk/local/20974
  No exact match found.