: a stickleback (Gasterosteus aculeatus) chiefly of fresh and brackish waters that typically has three dorsal spines

called also three-spine stickleback

Illustration of three-spined stickleback

Illustration of <span class=syl>three<span class=sylbreak>-</span>spined stickleback</span>
  • three-spined stickleback

Examples of three-spined stickleback in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The parasitic cestode Schistocephalus solidus requires a much larger host—specifically, a three-spined stickleback fish—to grow in and then a bird to breed in. Madhusree Mukerjee, Scientific American, 8 Sep. 2022 The three-spined stickleback, a small fish native to the Northern Hemisphere, looks for physical appeal—but it’s not based on shallow aesthetics. Brian Handwerk, National Geographic, 22 Oct. 2020

Word History

First Known Use

1769, in the meaning defined above

Time Traveler
The first known use of three-spined stickleback was in 1769

Browse Nearby Entries

See all Nearby Words

Cite this Entry

“Three-spined stickleback.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/three-spined%20stickleback. Accessed 2 Mar. 2025.

More from Merriam-Webster on three-spined stickleback

Love words? Need even more definitions?

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