noun 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.).
— synonyms: scallop, crenation, crenature, crenel
noun a notch or open space between two merlons in a crenelated battlement.
— synonyms: crenel