catalytic converter

American  

noun

• catalytic converters
  plural

1. an antipollution device in an automotive exhaust system that contains a catalyst for chemically converting some pollutants in the exhaust gases, as carbon monoxide, unburned hydrocarbons, and oxides of nitrogen, into harmless compounds.

---

catalytic converter British  

noun

1. Sometimes shortened to: catcon.  a device using three-way catalysts to reduce the obnoxious and poisonous components of the products of combustion (mainly oxides of nitrogen, carbon monoxide, and unburnt hydrocarbons) from the exhausts of motor vehicles

---

Other Word Forms

Noun Inflected Forms

• catalytic converters
  plural

Etymology

Origin of catalytic converter

First recorded in 1960–65

Example Sentences

See Examples For:

catalytic converter

Douglas Buckert said the cameras “changed the game” for catalytic converter theft investigations.

From Salon ● Sep. 6, 2026

Data from the license plate readers, known in law enforcement as LPRs, was searched 62,000 times in 2025, leading to about 1,660 cleared catalytic converter theft cases, a report from the authority said.

From Salon ● Sep. 6, 2026

This relic of combustion awakens in the morning with the refinement of a coffee grinder, winding at around 3,000 rpm until the catalytic converter heats up and the revs fall back to idle.

From The Wall Street Journal ● Aug. 15, 2026

The Police Department launched its investigation last July after noticing a “significant rise” in catalytic converter thefts.

From Los Angeles Times ● Apr. 3, 2026

It was boxy and angular, and it poured so much smoke out of its exhaust pipe, I was certain the Forges of some Dark Lord were firing deep within its catalytic converter.

From "Darius the Great Is Not Okay" by Adib Khorram