Illustration of three-spined stickleback
- three-spined stickleback
three-spined stickleback
noun
: a stickleback (Gasterosteus aculeatus) chiefly of fresh and brackish waters that typically has three dorsal spines
called also three-spine stickleback
Cite this Entry
“Three-spined stickleback.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/three-spined%20stickleback. Accessed 5 Jul. 2026.
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