algae.

Simple photosynthetic organisms, especially those growing in water, ranging from microscopic forms to large seaweeds.

Use it for

Words that belong together

• green algae
• algae bloom
• filamentous algae

On the page

Green algae coated the submerged stones.

The algae were thickest in the warm corner of the pond.

Threads of algae streamed from the fallen branch.

Usage notes

Primary category: environment. Plural of alga; common collective use can sound masslike, but formal agreement is plural. Plural noun; singular alga.