Adolescence /ˌæd

gas /gæs/ noun plural gases or gasses AIR SUBSTANCE
1. [ C or U ] a substance in a form like air that is neither solid nor liquid
Oxygen, hydrogen and nitrogen are all gases.
2. [ 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. poisonous/inflammable/toxic gas
a gas -fired power station
3. [ 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.
4. [ U ] mainly US for wind (BOWELS)
Beer gives me gas.