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alga

alga

/ˈæl.ɡə/

[C/U] Both
pl: algae

Refers to the singular form of algae, though in common speech, 'algae' is frequently used as both singular and plural. It evokes images of aquatic environments, ranging from microscopic organisms to massive kelp forests.

The term carries a neutral scientific connotation but can shift toward a negative one when describing "algal blooms," which often imply stagnation, pollution, or environmental imbalance in ponds and lakes.

Countable when referring to a single biological specimen or species ('a rare red alga'). Uncountable when referring to the mass of green slime covering a pond's surface.

💬Casual Conversation

🎬Tuesday afternoon at the office; Jessica is staring at a sample jar on her desk.
Jessica

Mark, why is there some kind of green alga growing in this sample?

Mark, why is there some kind of green alga growing in this sample?

Jessica
Mark
Mark

My bad. I totally spaced on the refrigeration thing.

My bad. I totally spaced on the refrigeration thing.

Meanings

Nounalga

A simple non-flowering aquatic plant that lacks true roots, stems, and leaves, typically consisting of a thallus and belonging to a diverse group of photosynthetic organisms.

A single green alga was observed under the microscope.

Etymology

Derived from the Latin alga, meaning seaweed, which originates from the Greek algon.

Related Words

Last Updated: May 2026Report an Error