Bot., Zool., etc. [f. CRENATE: see -ATION.] A crenated formation; a rounded toothing, e.g., on the margin of a leaf or shell; scalloping; a crenature.
1846. Dana, Zooph. (1848), 490. The polyps … have twelve short tentacles … in some species they are mere crenations to the disk.
1875. H. C. Wood, Therap. (1879), 317. A well-marked stellar crenation.
1884. Bower & Scott, De Bary’s Phaner., 376. In many teeth and crenations of the leaf.
