Frustule

 : 
Noun
 : 
frus=tule

CIDE DICTIONARY

Frustulen. [L. frustulum, dim. fr. frustum a piece: cf. F. frustule.].
     The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.  [1913 Webster]

OXFORD DICTIONARY

Frustule, n. Bot. the siliceous cell wall of a diatom.

Etymology
F f. L frustulum (as FRUSTUM)

For further exploring for "Frustule" in Webster Dictionary Online


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