crenation

Từ điển Oxford Learners Wordfinder Dictionary

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.)
• Syn:
scallop, crenature, crenel, crenelle
• Derivationally related forms:
scallop (for: scallop)
• Hypernyms:
curve, curved shape