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...
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http://en.wikipedia.org/wiki/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.
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http://thinkexist.com/dictionary/meaning/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 ...
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http://www.britannica.com/eb/a-z/f/67
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.
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http://www.encyclo.co.uk/webster/F/82
The mineral 'skeleton' of a diatom or other unicellular organism.
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http://www.ucmp.berkeley.edu/glossary/glossary_4.html
The siliceous lorica of a diatom.
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https://www.encyclo.co.uk/local/22457
the siliceous cell wall of a diatom.
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https://www.infoplease.com/dictionary/frustule
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