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Frustule :: Frustule (n.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover..

Diatom :: Diatom (n.) One of the Diatomaceae, a family of minute unicellular Algae having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariae, but this word is not in general use..

Diatomic :: Diatomic (a.) Containing two atoms.

Bacillariae :: Bacillariae (n. pl.) See Diatom.

Diatomic :: Diatomic (a.) Having two replaceable atoms or radicals.

Diatomous :: Diatomous (a.) Having a single, distinct, diagonal cleavage; -- said of crystals..

Valve :: Valve (n.) One of the two similar portions of the shell of a diatom.

Pleurosigma :: Pleurosigma (n.) A genus of diatoms of elongated elliptical shape, but having the sides slightly curved in the form of a letter S. Pleurosigma angulatum has very fine striations, and is a favorite object for testing the high powers of microscopes..

Tripoli :: Tripoli (n.) An earthy substance originally brought from Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms..

Diatom :: Diatom (n.) A particle or atom endowed with the vital principle.

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