crenation

[kri-ney-shuh n] /krɪˈneɪ ʃən/
noun
1.
a rounded projection or tooth, as on the margin of a leaf.
2.
Anatomy. (in erythrocytes) the state of being or becoming shrunken with a notched or indented edge.
3.
a notch between teeth.
Origin
1840-50; crenate + -ion
British Dictionary definitions for crenation

crenation

/krɪˈneɪʃən/
noun
1.
any of the rounded teeth or the notches between them on a crenate structure
2.
a crenate formation or condition
crenation in Medicine

crenation cre·na·tion (krĭ-nā'shən)
n.

  1. The condition or state of being crenate.

  2. A process resulting from osmosis in which red blood cells, in a hypertonic solution, shrink and acquire a scalloped surface.