mi·​cro·​al·​ga ˌmī-krō-ˈal-gə How to pronounce microalga (audio)
plural microalgae ˌmī-krō-ˈal-(ˌ)jē How to pronounce microalga (audio)
: a minute alga (such as a diatom or chlorella) that is not visible to the unaided eye
Dinoflagellates, along with diatoms and a dozen other forms of microalgae, serve as the very bottom of the food chain and, at 450 million to a billion years old, are among the most primitive forms of life on this planet.Patrick Huyghe
This green microalga grows in fresh and brackish water.Meghan Sapp
compare macroalga

Examples of microalga in a Sentence

Recent Examples on the Web One is a waste product left over after another type of omega-3 fatty acid, called EPA, has been extracted from the microalga for use in human nutritional supplements. Pallab Sarker, The Conversation, 14 Dec. 2020 The bun was enriched with chlorella, a microalga, and the sauce laced with sea lettuce, another common algae. Marta Zaraska, Discover Magazine, 13 Mar. 2019

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'microalga.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


micro- + alga

First Known Use

1869, in the meaning defined above

Time Traveler
The first known use of microalga was in 1869

Dictionary Entries Near microalga

Cite this Entry

“Microalga.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microalga. Accessed 19 Jun. 2024.

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