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Crenel
01
垛口
a notched or indented opening in a battlement or parapet, typically used for observation or defensive purposes
02
垛口
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.)
to crenel
01
垛口
supply with battlements
