duct tape noun 1verb 1forms 4 noun1 •A generally gray waterproof adhesive tape used for many purposes and easy to cut with the hands.I used duct tape to cover the hole in a leaky pipe. verb1 •To use duct tape in order to tape one object to another.The government tells us we can protect against a chemical attack by duct taping the windows. formsduct taped · duct taping · duct tapes · duct-tapes