From ZooTerms (Dictionary of Invertebrate Zoology)
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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.