Definitions from Wiktionary (diatom)

▸ noun:  Any of a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class Diatomophyceae or division Bacillariophyta.
▸ noun:  (chemistry) A molecule composed of two atoms of the same element; a homonuclear diatomic molecule.
▸ Also see diatom





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