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Webster's Dictionary (1865)

Crē'nā-ted, a.

adjective

a. [From Lat. crēna, notch. Cf. CRANNY.] (Bot.) Having the edge cut or notched in the form of a scallop-shell; crenelated.

Three leaves are shown with margins that are respectively doubly serrated, acutely toothed, and obtusely toothed.
Doubly. Acutely. Obtusely.