Source : Webster's Revised Unabridged Dictionary (1913)

Denticle \Den"ti*cle\, n. [L. denticulus a little tooth, dim. of
   dens, dentis, tooth. See {Dental}, and cf. {Dentelli}.]
   A small tooth or projecting point.

Source : WordNet®

denticle
     n : small pointed ridge on the exoskeleton of an arthropod