hydrochlorothiazide: a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension
thiazide: any of a group of drugs commonly used as diuretics in the treatment of hypertension; they block the reabsorption of sodium in the kidneys
high-speed steel: an alloy steel that remains hard at a red heat; used to make metal-cutting tools