- alga, algae - primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
--1 is a kind of protoctist
--1 has particulars:seaweed; golden algae; yellow-green algae; diatom; confervoid algae; brown algae; euglenoid, euglenophyte, euglenid; green algae, chlorophyte; chlorella; red algae; cryptomonad, cryptophyte