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Noun diatom has 1 sense
  1. diatom - microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica
    --1 is a kind of     alga, algae; phytoplankton
    --1 is a member of
     Bacillariophyceae, class Bacillariophyceae, Diatomophyceae, class Diatomophyceae
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