diatom

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di·a·tom

(dī'ă-tom),
An individual of microscopic unicellular algae, the shells of which comprise a sedimentary infusorial earth.
[G. diatomos, cut in two]

diatom

/di·a·tom/ (di´ah-tom) a unicellular microscopic form of alga having a cell wall of silica.

diatom

(dī′ə-tŏm′)
n.
Any of various microscopic one-celled or colonial heterokonts of the class Bacillariophyceae that are photosynthetic, have a silica cell wall made up of two interlocking parts, and form an important component of phytoplankton.

diatom

a member of the BACILLARIOPHYCEAE.