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[fruhs-chool] /ˈfrʌs tʃul/

noun, Botany.
the siliceous cell wall of a diatom.
(botany) the hard siliceous cell wall of a diatom
The silica-rich cell wall of a diatom. Frustules are divided into two halves, and the intricate patterns of depressions and projections on each half help to identify individual diatom species.


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