The Collaborative International Dictionary of English v.0.48:

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. Denticulate

WordNet (r) 3.0 (2006):

denticle
    n 1: small pointed ridge on the exoskeleton of an arthropod

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "denticle":
   baby tooth, bicuspid, bucktooth, canine, crown, cuspid, cutter,
   deciduous tooth, dent, denticulation, dentil, dentition, dogtooth,
   eyetooth, fang, fore tooth, gagtooth, gang tooth, gold tooth,
   grinder, incisor, milk tooth, molar, peg, permanent tooth,
   pivot tooth, premolar, scrivello, snag, snaggletooth, tooth, tush,
   tusk, wisdom tooth