The story
Probably from te(t)ra(hydrofuran) + -azosin + [Term?] (“prazosin-derived antihypertensive”).
Etymology from Wiktionary, CC BY-SA 4.0.
terazosin
Today it means: A drug taken orally in the form of its hydrated hydrochloride C₁₉H₂₅N₅O₄·HCl·2H₂O in the treatment of benign prostatic hyperplasia and hypertension. Full definition →