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duct tape n. [perhaps an alteration of earlier duck tape n. at duck n.³ Additions] originally North American a strong cloth-backed waterproof adhesive tape, originally used for sealing joints in heating and ventilation ducts, and (later) for holding electrical cables securely in place, now in widespread general use esp. to repair, secure, or connect a range of appliances, fixtures, and equipment; cf. gaffer tape n. at gaffer n. Additions.