| Noun | 1. | Orinase - sulfonylurea; an oral antidiabetic drug (trade name Orinase) used in the treatment of adult-onset diabetes mellitus sulfonylurea - antidiabetic consisting of any of several drugs that reduce the level of glucose in the blood; used to treat diabetes mellitus hypoglycaemic agent, hypoglycemic agent - any of various agents that decrease the level of glucose in the blood and are used in the treatment of diabetes mellitus |