alga alga /ˈælɡə/

noun

1. Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves  ( alga , algae )
   primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
     The pond was covered in a vibrant green blanket of algae, providing a habitat for various organisms.
   The pond was covered in a vibrant green blanket of algae, providing a habitat for various organisms.