Definition of prismatic layer in English:

prismatic layer

Line breaks: pris|mat¦ic layer

noun

Zoology
  • The middle layer of the shell of a mollusc, consisting of crystalline calcite or aragonite.
    More example sentences
    • The prismatic layer is the middle layer and is composed of thin blocks of a prism-like calcium carbonate, which are oriented perpendicular to the mantle and the other two layers.
    • Thinner extensions from the prismatic layer in Pseudobigalea crista also form comarginal ridges.
    • As a result, it has been difficult to identify detailed or minute shell structures embedded in the thick prismatic layer or secondary thickening at the shell posterior.

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Pronunciation: mɪˈlɔːd
noun
used to address an English nobleman