keyhole Syllabification: (key·hole)Pronunciation: /ˈkēˌhōl/Translate keyhole | into French | into German | into Italian | into Spanish Definition of keyhole noun a hole in a lock into which the key is inserted. a circle cut out of a garment as a decorative effect, typically at the front or back neckline of a dress. keyhole in other Oxford dictionaries Definition of keyhole in the British & World English dictionary