noun (plural gases or chiefly US gasses)[mass noun]
- Physics a gaseous substance that cannot be liquefied by the application of pressure alone. Compare with vapour.
- 2North American informalshort for gasoline.we stopped for gas
verb (gases, gassing, gassed)[with object]
mid 17th century: invented by J. B. van Helmont (1577–1644), Belgian chemist, to denote an occult principle which he believed to exist in all matter; suggested by Greek khaos 'chaos', with Dutch g representing Greek kh
Add -es to make the plural of words which end in -s: gases (the spelling gasses is mainly American).
If a one-syllable word ends with a single vowel plus a consonant (as in stop), double the last letter when adding -ing or -ed: (gases or gasses, gassing, gassed).