off-gas
off-gas noun: gas produced as a side effect of a chemical reaction, sometimes hazardous.
Noun
off-gas (countable and uncountable, plural off-gases or off-gasses)
- Gas produced as a side effect of a chemical reaction, sometimes hazardous.
Verb
off-gas (third-person singular simple present off-gases or off-gasses, present participle off-gassing, simple past and past participle off-gassed)
- To emit gases, especially noxious ones.
- Since solvent-based paints can off-gas for a long time as they dry, when trapped in a tightly sealed building they can contribute to an unhealthy cocktail of chemicals in the air.2004, Old-House Journal, page 86
- Moving along to consider @CZ662C’s even worse-looking CD fragments, and the tech detectives on X reckon this dramatic damage was caused by storage in a foam-padded case. Some foam padding materials, the story goes, will off-gas ammonia compounds.2026 August 15, Mark Tyson, “Catastrophic optical disc shattering blamed on cleaning chemicals and packing foam — another data preservation concern to add to bit rot and laser rot”, in Tom's Hardware
- Synonyms:
- outgas
Synonyms of off-gas
Forms of off-gas
| Noun | |
|---|---|
| plural | off-gases |
| plural | off-gasses |
| Verb | |
| third-person singular present | off-gases |
| third-person singular present | off-gasses |
| present participle | off-gassing |
| past participle | off-gassed |
| past | off-gassed |
Origin of off-gas
From off- + gas.
Questions about off-gas
- What does off-gas mean?
- Off-gas means gas produced as a side effect of a chemical reaction, sometimes hazardous.
- What part of speech is off-gas?
- Off-gas can be a noun or a verb.
- What is the plural of off-gas?
- The plural of off-gas is off-gases.
Words near off-gas in the dictionary
Source and license
Adapted from Wiktionary: off-gas (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Cite this entry: “off-gas.” Word.ws, https://word.ws/off-gas. Based on Wiktionary, CC BY-SA 4.0.