threespine stickleback

or three-spined stick·le·back

[ three-spahyn stik-uh l-bak or three-spahynd stik-uh l-bak ]
/ ˈθriˌspaɪn ˈstɪk əlˌbæk or ˈθriˌspaɪnd ˈstɪk əlˌbæk /

noun

a widely distributed stickleback, Gasterosteus aculeatus, occurring in marine, brackish, or fresh waters throughout the northern hemisphere.

Origin of threespine stickleback

First recorded in 1890–95

Words nearby threespine stickleback