ELASMOBRANCH Meaning of ELASMOBRANCH in English n. Zool. any cartilaginous fish of the subclass Chondrichthyes, e.g. sharks, skates, rays. Etymology: mod.L elasmobranchii f. Gk elasmos beaten metal + bragkhia gills Oxford English vocab. Оксфордский английский словарь. 2012