noun B2 Greek origin catalyst /ˈkætəlɪst/  ·  KAT-uh-list محرکتحریکپروگرام کا سبب Roman Urdu: muharrik ENGLISH MEANING A substance that speeds up a reaction without being used up. In chemistry, a catalyst increases the rate of a chemical reaction while remaining unchanged at the end. Metaphorically, it describes a person, event, or thing that provokes rapid[...]