noun
: a tube in many echinoderms having a wall that contains calcareous deposits and leading from the circumoral ring of the water-vascular system to the madreporite
noun
: a tube in many echinoderms having a wall that contains calcareous deposits and leading from the circumoral ring of the water-vascular system to the madreporite
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012