noun B2 Greek origin catalyst /ˈkætəlɪst/  ·  KAT-uh-list تحریک کنندہشتاب دینے والامحرک Roman Urdu: tahreek karnay wala ENGLISH MEANING A substance that speeds up a reaction without being consumed. A catalyst increases the rate of a chemical reaction while remaining unchanged itself. It is also used metaphorically for a person or event that triggers significant[...]