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What is another word for crenel?

What's another word for crenel? | Here's a list of synonyms for crenel.

Definition 1: a notch or open space between two merlons in a crenelated battlement - [noun denoting artifact]

Definition 1: one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.) - [noun denoting shape]

Definition 1: supply with battlements - [verb of possession]