| Main Entry: | swamp gas |
| Part of Speech: | noun |
| Definition: | poison gas |
Synonyms: |
marsh gas |
| Main Entry: | marsh gas |
| Part of Speech: | noun |
| Definition: | poison gas |
Synonyms: |
methane, swamp gas |
| Main Entry: | poison gas |
| Part of Speech: | noun |
| Definition: | poisonous gas |
Synonyms: |
marsh gas, mustard gas, swamp gas, war gas |