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.)
同义词：scallop, crenation, crenel, crenelle
详细解释：
cren.a.ture n.（名词）A rounded projection; a crenation.圆形突起；钝锯齿