Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “gas”


noun (AIR SUBSTANCE)    /ɡæs/
B2 [C or U] a substance in a form like air that is neither solid nor liquid : Oxygen , hydrogen and nitrogen are all gases. poisonous / inflammable / toxic gasThe state of matter A2 [C or U] a substance in a form like air that is used as a fuel for heating and cooking : Do you prefer cooking with electricity or gas?UK A leak in the gas mains (= pipes ) caused a major explosion . a gas- fired power station FuelsPetroleum products especially when used as fuel [U] informal a substance in a form like air used for medical purposes to prevent people feeling pain or being conscious during an operation : I had/was given gas when I got my wisdom teeth out.SurgeryMedicine in different forms [U] mainly US for wind noun: Beer gives me gas.Digestive disorders
(Definition of gas noun (AIR SUBSTANCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of gas

Browse related topics

You are looking at an entry to do with Fuels, but you might be interested in these topics from the Energy & fuels topic area:

Definitions of “gas” in other dictionaries

Word of the Day


relating to behaviour between people that is pleasant and friendly, often despite a difficult situation

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More