threespine stickleback: Meaning and Definition of

three'spine stick'leback

Pronunciation: (thrē'spīn"), [key]
  1. a widely distributed stickleback, Gasterosteus aculeatus, occurring in marine, brackish, or fresh waters throughout the northern hemisphere.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.