| marsh gas | |
| —n | |
| a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air | |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a scrap or morsel of food left at a meal. |
marsh gas n.
See methane.