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serrulation

serrulation
  (sɛrjʊˈleɪʃən)
  [f. prec.: see -ation.]
  The condition of being serrulated; a fine or minute serration.

1821 W. P. C. Barton Flora N. Amer. I. 59 The margin..in the older leaves..marked by about four serratiform indentures, scarcely deserving the appellation of serrulations. 1881 Jrnl. Bot. X. 115 The serrulation on the back of the nerve was also continued lower down.

Oxford English Dictionary

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