frustule

noun
frus·​tule | \ˈfrəs-(ˌ)chül, -(ˌ)t(y)ül\

Definition of frustule 

: the 2-valved siliceous shell of a diatom

First Known Use of frustule

1848, in the meaning defined above

History and Etymology for frustule

French, from Latin frustulum, diminutive of frustum

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The first known use of frustule was in 1848

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