noun
: the cartilaginous structure supporting the gills in protochordates and lower vertebrates (as ascidians, amphioxi, and cyclostomes)
noun
: the cartilaginous structure supporting the gills in protochordates and lower vertebrates (as ascidians, amphioxi, and cyclostomes)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012