noun (plural gases or gasses)
- Physics a gaseous substance that cannot be liquefied by the application of pressure alone. Compare with vapor.
- 2North American informalshort for gasoline.
verb (gases, gassed, gassing)[with object]
mid 17th century: invented by J. B. van Helmont (1577–1644), Belgian chemist, to denote an occult principle that he believed to exist in all matter; suggested by Greek khaos 'chaos', with Dutch g representing Greek kh
The plural of gas can be spelled either gases or gasses: both are correct.
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).