Source : Webster's Revised Unabridged Dictionary (1913)

Sclerite \Scle"rite\ (skl[=e]"r[imac]t), n. (Zo["o]l.)
   A hard chitinous or calcareous process or corpuscle,
   especially a spicule of the Alcyonaria.

Source : WordNet®

sclerite
     n : hard plate or element of the exoskeleton of some arthropods