Zool. and Bot. [f. as prec. + -ATION.] A crenulated formation; a minute rounded marginal tooth or crenation.
1846. Dana, Zooph. (1848), 391. The lamellæ are marginal crenulations.
1881. R. B. Watson, in Jrnl. Linn. Soc., XV. 452. Forming on the upper whorls infrasutural crenulations.
