three-spined stickleback
noun
\ ˈthrē-ˈspīn(d)-
\
\
Definition of three-spined stickleback
: 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
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