1 adj In chemistry, a catalytic substance or a substance with catalytic properties is a substance which increases the speed of a chemical reaction.
...carbon molecules with unusual chemical and catalytic properties.
2 adj If you describe a person or thing as having a catalytic effect, you mean that they cause things to happen or they increase the speed at which things happen. FORMAL usu ADJ n Governments do, however, have a vital catalytic role in orchestrating rescue operations.
catalytic converter ( catalytic converters plural ) A catalytic converter is a device which is fitted to a car's exhaust to reduce the pollution coming from it. n-count
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"