Bible Dictionaries
Frustule
Webster's Dictionary
(n.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.
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Bibliography Information
Webster, Noah. Entry for 'Frustule'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/f/frustule.html. 1828.