Frustule

A frustule is the hard and porous cell wall or external layer of diatoms. The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred to in the early literature on diatoms as pectin, a fiber most commonly found in cell walls of plants. This layer is actually composed...
Found on http://en.wikipedia.org/wiki/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.
Found on http://thinkexist.com/dictionary/meaning/frustule/

frustule

(from the article `algae`) The diatoms (class Bacillariophyceae) played an important role in industrial development during the 20th century. The frustules, or cell walls, of ...
Found on http://www.britannica.com/eb/a-z/f/67

Frustule

Frus'tule noun [ Latin frustulum , dim. from frustum a piece: confer French frustule .] (Botany) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.
Found on http://www.encyclo.co.uk/webster/F/82

frustule

The mineral 'skeleton' of a diatom or other unicellular organism.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_4.html

frustule

The siliceous lorica of a diatom.
Found on http://tolweb.org/tree/home.pages/glossary.html
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