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[...]
noun B2 Latin origin luminescence /luːmɪˈnɛs(ə)ns/ · loo-mi-NES-uhns چمکنوری تابروشنی Roman Urdu: Nūrūnī roshni ENGLISH MEANING Emission of light without a rise in temperature. Luminescence is the process by which a substance releases light as a result of a chemical, biological, or physical reaction that does not produce heat. It is commonly used in scientific[...]