Dictionary![]() ![]() three'spine stick'lebackPronunciation: (thrē'spīn"), [key] a widely distributed stickleback, Gasterosteus aculeatus, occurring in marine, brackish, or fresh waters throughout the northern hemisphere. Also,three'-spined stick'le•back. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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