Noun | 1. | ![]() family Gasterosteidae, Gasterosteidae - sticklebacks Gasterosteus aculeatus, three-spined stickleback - of rivers and coastal regions Gasterosteus pungitius, ten-spined stickleback - confined to rivers acanthopterygian, spiny-finned fish - a teleost fish with fins that are supported by sharp inflexible rays |