Assertion: diatom's shell | /r/HasProperty | frustule
Facets:
Source sentences:
text: The silicified cell wall forms a pillbox-like shell (frustule) composed of overlapping halves (epitheca and hypotheca) perforated by intricate and delicate patterns.
text: Their shell (really a cell wall) is called a frustule and is made up of two distinct halves, or valves.
text: Diatoms, and their shells (frustules) as diatomite or diatomaceous earth, are important industrial resources used for fine polishing and liquid filtration.