noun
- a simple plant-like organism that lives in water and lacks true roots, stems, and leaves
Usage: biology
Examples
- Green alga covered the surface of the pond.
- Marine biologists study different types of alga in the ocean.
- The aquarium glass was coated with a thin layer of alga.
- Red alga is commonly found in deeper ocean waters.
- Scientists use alga to produce biofuels.
- The lake’s ecosystem depends on various species of alga.