alga

noun
al·​ga | \ ˈal-gə How to pronounce alga (audio) \
plural algae\ ˈal-​(ˌ)jē How to pronounce alga (audio) \ also algas

Definition of alga

: a plant or plantlike organism of any of several phyla, divisions, or classes of chiefly aquatic usually chlorophyll-containing nonvascular organisms of polyphyletic origin that usually include the green, yellow-green, brown, and red algae in the eukaryotes and especially formerly the cyanobacteria in the prokaryotes

Keep scrolling for more

Other Words from alga

algal \ ˈal-​gəl How to pronounce alga (audio) \ adjective

Examples of alga in a Sentence

Recent Examples on the Web This particular photograph also documents the incremental nature of the scientific method: DNA analysis has shown that people mistakenly lumped at least three alga species under the name Halymenia latifolia since that label was created. Leslie Nemo, Scientific American, "Female Botanist Published the First Ever Photo Book," 29 Mar. 2021 Once the water temperature returns to normal, any polyps that haven’t starved to death will host another alga. Erik Stokstad, Science | AAAS, "In surprising sign of resilience, some corals can survive long heat waves," 8 Dec. 2020 The melt increases the water in the area of the alga. Jeff Lowenfels, Anchorage Daily News, "An Anchorage woman noticed red snow in her backyard. Here’s a possible cause.," 19 Nov. 2020 However, Biagio Di Mauro, a researcher at the Institute of Polar Sciences in Italy’s National Research Council tweeted that the pink snow was probably the result of Chlamydomonas nivalis, which is a snow alga. Fox News, "Why has pink snow appeared in the Alps?," 7 July 2020 Near the back, leaning on the vase, is an alga from an herbarium of strange, incredible shapes, which could have been invented by Max Ernst. Louis Benech, WSJ, "The Treasures of France’s Most Revered Gardener," 28 Mar. 2020 And seaweed is really just an extremely large alga—in fact, seaweeds are also called macroalgae. Caroline Delbert, Popular Mechanics, "Seaweed: The New Ethanol?," 16 Mar. 2020 The alga was discovered in Little Muskego Lake in 2014 and has since also been identified in Big Muskego Lake. Evan Frank, Milwaukee Journal Sentinel, "An invasive species called starry stonewort has spread to Lake Country waters," 16 Sep. 2019 In Florida and Texas, red tides are caused by an alga called Karenia brevis. Tom Metcalfe, NBC News, "What is red tide?," 13 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alga.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of alga

1551, in the meaning defined above

History and Etymology for alga

Latin, seaweed

Keep scrolling for more

Learn More about alga

Statistics for alga

Last Updated

7 Apr 2021

Cite this Entry

“Alga.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alga. Accessed 17 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for alga

alga

noun
al·​ga | \ ˈal-gə How to pronounce alga (audio) \
plural algae\ ˈal-​ˌjē \

Kids Definition of alga

: any of a large group of simple plants and plant-like organisms (as a seaweed) that usually grow in water and produce chlorophyll like plants but do not produce seeds

alga

noun
al·​ga | \ ˈal-gə How to pronounce alga (audio) \
plural algae\ ˈal-​(ˌ)jē How to pronounce alga (audio) \ also algas

Medical Definition of alga

: a plant or plantlike organism of any of several phyla, divisions, or classes of chiefly aquatic usually chlorophyll-containing nonvascular organisms of polyphyletic origin that usually include the green, yellow-green, brown, and red algae in the eukaryotes and especially formerly included the cyanobacteria in the prokaryotes

Other Words from alga

algal \ -​gəl How to pronounce alga (audio) \ adjective

More from Merriam-Webster on alga

Nglish: Translation of alga for Spanish Speakers

Britannica English: Translation of alga for Arabic Speakers

Britannica.com: Encyclopedia article about alga

Comments on alga

What made you want to look up alga? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
 AlphaBear 2

Spell words. Make bears.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!