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Definition of alga

alga

/ˈæl.ɡə/
al · ga
Plural:algae
•
Adjective:algal
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alga Lexical Profile

alga Game Scores & Validity

• noun

1

A simple, non-flowering, and typically aquatic photosynthetic organism of a large and diverse group that includes seaweeds and many single-celled forms, containing chlorophyll but lacking true stems, roots, leaves, and vascular tissue.

Example

"The biologist examined a single microscopic green alga under the high-powered lens to study its chloroplast structure."

Synonyms
View all synonyms for alga

Word Nuance & Usage

In everyday English, the plural form 'algae' is used far more frequently, often treated as a collective or uncountable noun, whereas the singular 'alga' is primarily confined to scientific or technical contexts when referring to an individual organism or species.

• Rhymes for alga

• Nearby Words

alfoil
alfredo
alfresco
alga
algae
algae eater
algal

Word Origin & Etymology

Borrowed in the mid-16th century directly from Latin 'alga', meaning 'seaweed', of uncertain ultimate origin.

Cite this Entry

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