diatom

3 ENTRIES FOUND:

di·a·tom

noun \ˈdī-ə-ˌtäm\

Definition of DIATOM

:  any of a class (Bacillariophyceae) of minute planktonic unicellular or colonial algae with silicified skeletons that form diatomaceous earth

Origin of DIATOM

ultimately from Greek diatomos cut in half, from diatemnein to cut through, from dia- + temnein to cut — more at tome
First Known Use: 1845

di·a·tom

noun \ˈdī-ə-ˌtäm\   (Medical Dictionary)

Medical Definition of DIATOM

: any of a class (Bacillariophyceae) of minute planktonic unicellular or colonial algae with silicified skeletons that form diatomite

diatom

noun    (Concise Encyclopedia)

Diatom (highly magnified)—Eric Grave/Photo Researchers

Any member of the algal class Bacillariophyceae (division Chromophyta), with about 16,000 species. They are tiny, planktonic (see plankton), unicellular or colonial algae found floating in all the waters of the earth. The intricate and delicate markings of the silicified cell wall are useful in testing the resolving power of microscope lenses. The beautiful symmetry and design of diatoms justify their title “jewels of the sea.” Among the most important and prolific sea organisms, diatoms serve directly or indirectly as food for many animals. Diatomaceous earth, composed of fossil diatoms, is used in filters, insulation, abrasives, paints and varnishes, and as an insecticide.

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