The definition of a battlement is the design at the top of old castle walls that looks like upside down teeth and is used to allow space for archers or sharpshooters to fire at intruders.(noun)
An example of a battlement is the stone architecture seen atop a medieval watchtower.
See battlement in Webster's New World College Dictionary
Origin: ME batelment < OFr bataillier, to fortify < bataille, fortification on a wall or tower < ? VL *battacula, place of battle < battere, batter
See battlement in American Heritage Dictionary 4
Origin: Middle English batelment
Origin: , alteration (influenced by batel, battle)
Origin: of Old French batillement, tower, turret
Origin: , from bastille; see bastille.
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