A member of the genus Diatoma, or, in a wider sense, of the Diatomaceæ, an order of microscopic unicellular Algæ, with silicified cell-walls, and…
†(a) (J. Lindley's name for) a diatom (obsolete); (b) a stonewort (order Charales).
A diatomaceous plant, a diatom.
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