1. alga

noun. primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.


  • brown algae
  • cryptophyte
  • cryptomonad
  • seaweed
  • chlorella
  • euglenoid
  • euglenophyte
  • golden algae
  • diatom
  • protoctist
  • chlorophyte
  • red algae
  • yellow-green algae
  • confervoid algae
  • green algae
  • euglenid

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Sentences with alga

1. Noun, singular or mass
The green alga will help oxygenate a pond and when it dies off, it can cause a depletion of oxygen in the water and the fish can die as a result.