alga
noun
any organism belonging to one of the numerous groups of algae.
algal
-
a word derived from
alga.
-
a word derived from
algae.
algaeplural nounany of numerous groups of chlorophyll-containing, mainly aquatic, eukaryotic organisms ranging from microscopic single-celled forms to multicellular forms 100 feet (30 meters) or more long, distinguished from plants by the absence of true roots, stems, and leaves and by a lack of nonreproductive cells in the reproductive structures: classified into the six phyla Euglenophyta, Crysophyta, Pyrrophyta, Chlorophyta, Phaeophyta, and Rhodophyta.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
There have been measurements of harmful algal blooms along the California coast already.
From Los Angeles Times ● Sep. 10, 2026
Norwegian salmon producer Mowi was hit in 2016 after warm water in Chilean fjords caused algal blooms that asphyxiated millions of fish.
From The Wall Street Journal ● Aug. 29, 2026
In South Australia, a devastating algal bloom linked to marine heat conditions has also been associated with numerous health problems in coastal communities.
From Science Daily ● Aug. 11, 2026
In 2025, the toxic algal bloom in South Australia was associated with high levels of 'eco-anxiety,' as well as grief, frustration and depression.
From Science Daily ● Aug. 11, 2026
Heavy algal blooms were noted in the Black Vermillion River and Mill Creek, Washington County, in 1957 and 1958.
From Fishes of the Big Blue River Basin, Kansas by W. L. Minckley
