- endostracum
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n. [Gr. endon, within; ostrakon, shell]1. (ARTHROPODA: Chelicerata)For arachnids, see epiostracum.2. (ARTHROPODA: Insecta)The endocuticle.3. (MOLLUSCA)The inner layer of a shell.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.