What does crenate mean

(especially of a leaf or shell) having a round-toothed or scalloped edge

having a round-toothed or scalloped edge.

Explanation:

A rounded projection, as on the margin of a shell. The condition or state of being crenate. A process resulting from osmosis in which red blood cells, in a hypertonic solution, undergo shrinkage and acquire a notched or scalloped surface.