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Definition of algae

algae

/ˈæl.dʒiː/
al · gae
Plural:algae
•
Adjective:algal
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algae Lexical Profile

algae Game Scores & Validity

• noun

1

A diverse group of simple, typically aquatic photosynthetic organisms that contain chlorophyll and range from microscopic single-celled phytoplankton to large multicellular seaweeds such as kelp, but lack the true roots, stems, leaves, and vascular tissues of land plants.

Example

"A thick layer of green algae covered the surface of the stagnant pond during the summer heatwave."

Synonyms
View all synonyms for algae

Word Nuance & Usage

"Algae" is the plural of "alga," though it is frequently treated as an uncountable mass noun taking a singular or plural verb depending on whether a substance or distinct organisms are meant.

• Nearby Words

alfredo
alfresco
alga
algae
algae eater
algal
algebra

Word Origin & Etymology

Borrowed in the mid-16th century directly from Latin "algae," the plural of "alga" meaning "seaweed."

Cite this Entry

Wordmom. (2026). Definition of Algae. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/algae
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