glossary of diabetes glossary of diabetes the following is a glossary of diabetes which explains terms connected with diabetes. a acanthosis nigricans a brown to black, poorly defined, velvety hyperpigmentation of the skin, usually present in the posterior and lateral folds of the neck, the axilla, groin, umbilicus, and other areas. this occurs due to insulin spillover (from excessive production due to obesity or insulin resistance) into the skin which results in abnormal growth being observed. the most common cause would be insulin resistance, usually from type 2 diabetes mellitus. ace inhibitor angiotensin conversion enzyme. a class of drugs used to decrease hypertension, mainly by interfering with the renin kidney—blood pressure control cycle. an example is ramparil. (see arb). adult-onset diabetes one of the former terms for type 2 diabetes. see: type 2 diabetes mellitus. acetohexamide a pill taken to lower the level of glucose (sugar) in the blood. people with type 2 diabetes may take these pills.