1. diatom

noun. microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica.


  • class Bacillariophyceae
  • phytoplankton
  • class Diatomophyceae
  • alga
  • Bacillariophyceae
  • Diatomophyceae

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Sentences with diatom

1. Adjective
Sometimes diatom shells in seafloor sediment can over time become diatomaceous earth.

2. Noun, singular or mass
You can make your own diatom filter in less than an hour with materials from your local aquarium supply and hardware store.