ossicle
From ZooTerms (Dictionary of Invertebrate Zoology)
ossicle (noun; Latin diminutive os, ossis, bone): 1. A small nodule of chitin that resembles bone.
2. (Arthropoda: Crustacea) Teeth and tooth-like process in the gastric mill.
3. (Arthropoda: Insecta) For Diptera, see axillary sclerites.
4. (Echinodermata) Plates, spicules and rods that make up the structure of the endoskeleton.
