The story
From r(apid) + o(nset) + -curonium (“neuromuscular blocking agent”).
Etymology from Wiktionary, CC BY-SA 4.0.
rocuronium
Today it means: An aminosteroid nondepolarizing neuromuscular blocker used in anesthesia, to facilitate endotracheal intubation, and to provide skeletal muscle relaxation during surgery or mechanical ventilation. Full definition →