Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue[3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF …

Reduce emissions and keep your diesel vehicle running clean with diesel exhaust fluid (DEF) from AutoZone. We sell the best brands, including AutoZone, Lumax, and Peak Blue DEF fluid.

What does the abbreviation DEF stand for? Meaning: defendant; defense. How to use def in a sentence.

Jul 29, 2024 · Diesel exhaust fluid, or DEF, is a key component in lowering pollutants emitted from diesel engines, helping to improve efficiency and reduce emissions.

Nov 17, 2025 · Failing to see the word's antecedents, I suspected that def was either bogus or an orphan, lost to its slang ancestors through mispronunciation or misspelling […]

DEF meaning: 1. very good: 2. very good: . Learn more.

8 meanings: slang very good, esp of hip-hop definition → 1. a formal and concise statement of the meaning of a word, phrase,.... Click for more definitions.

Dec 9, 2025 · Learn what Diesel Exhaust Fluid (DEF) is, how it works, and why it’s essential for reducing emissions and improving diesel engine efficiency.

DEF definition: definitely. See examples of def used in a sentence.

Dec 8, 2021 · DEF stands for diesel exhaust fluid and can help you meet those regulations and keep your operations on track. The fluid reduces pollutant emissions and may help you stay …