noun🔗ShareEspinosoAny one of numerous species of small fish of the family Gasterosteidae. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct nests from weeds."While exploring the shallow brackish water near the beach, we spotted a tiny stickleback darting among the seaweed, its spiny back glinting in the sun. "Mientras explorábamos las aguas salobres poco profundas cerca de la playa, vimos un diminuto espinoso que se movía entre las algas, con su espalda espinosa brillando al sol.fishanimalbiologynatureorganismChat with AIVocabulary GamePractice Reading