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.).
1. Noun, singular or mass The cell will shrivel up, a process referred to as crenation"" aria-label="Link to "crenation""> "crenation."