periplast
/ˈpɛrɪplast/Biology
noun
Originally: †a cell wall (obsolete ). Now: specifically the wall of a unicellular organism, especially that of an alga of the division Cryptophyta, consisting of stiff proteinaceous plates.
Origin
Mid 19th century (in an earlier sense). From peri- + -plast. With specifically use in sense 2 compare German Periplast.
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