crenelle
(noun)
noun
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.)
Similar word(s): crenation, crenature, crenel, scallop
Definition categories: shape, curve
2. a notch or open space between two merlons in a crenelated battlement
Similar word(s): crenel
Definition categories: man–made, space