alga Meaning, Definition & Usage

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

WordNet

Al"ga noun
Etymology
L., seaweed.
Wordforms
plural Algæ
Definitions
  1. (Bot.) A kind of seaweed; pl. the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water confervæ, etc.

Webster 1913