Definition of Crenel

Noun: crenel kre-n(u)l

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.)
- scallop, crenation, crenature, crenelle
A notch or open space between two merlons in a crenelated battlement
- crenelle

Verb: crenel (crenelled,crenelling) kre-n(u)l