EPIOSTRACUM

epiostracum: translation

n. [Gr. epi, upon; ostrakon, shell]

(ARTHROPODA: Chelicerata)

1. A thin elastic, colorless layer of the cuticle of arachnids which overlies the ectostracum layer; further divided into two layers: inner, dense and proteinaceous, and outer, cuticulin.

2. The upper layer of cuticle of arachnids.