frustule

frus·tule (frus′tyo̵̅o̅l′, -c̸ho̵̅o̅l′)

noun

either of the two interlocking halves of the hard, siliceous shell of a diatom cell

Etymology: Fr < L frustulum, dim. of frustum, a piece: see frustum

Preposition: of

diatom: The brown mass you can see near the base, is a sort of gizzard with the ability to break siliceous frustules of diatoms!

Modifies a noun

spacing: This value is smaller than the frustule spacing of 0.72 µm and hence we should be able to resolve this structure.

Noun used with modifier

diatom: The dots which are fine markings on the diatom frustule are now clearly seen.

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