Definition of catalyser in English:

catalyser

noun

British
another term for catalytic converter
‘Conversely, heating is retained in the exhaust manifold to prevent the expelled gas cooling before it reaches the catalyser so that final harmful emissions from the car are minimised.’
another term for catalytic converter
‘Exhaust gas conduit of an internal combustion engine with a starting catalyser arranged near the engine’

Pronunciation

catalyser

/ˈkat(ə)lʌɪzə/