keyhole C2 Topic:Materials & Substances US /ˈkiˌhoʊl/ See IPA manual Freq #21602 Meanings 1 noun the hole where a key is inserted Some person was looking through the keyhole again. 2 noun A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting. Laser keyhole welding. 3 noun The hole in a lock where the key is inserted and turns. 4 noun Any small opening resembling the hole for a key in shape or function; especially, one that gives a vista of, or access to, a space beyond. Common collocations keyhole saw Noun + noun Etymology From key + hole. Topics Materials & Substances External links Cambridge Dictionary Wiktionary Google Images # keyhole **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˈkiˌhoʊl/ **Frequency rank:** 21602 ## Meanings 1. the hole where a key is inserted 2. A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting. 3. The hole in a lock where the key is inserted and turns. 4. Any small opening resembling the hole for a key in shape or function; especially, one that gives a vista of, or access to, a space beyond. ## Examples - Some person was looking through the keyhole again. - Laser keyhole welding. ## Etymology From key + hole. ## Topics - Materials & Substances markdown