Frommethane +‎-i- +‎-ferous.

methaniferous (comparativemoremethaniferous,superlativemostmethaniferous)

1. That producesmethane (used especially of certain bacteria).
   • 1911,Gas World, volume55, page196:

     But this “methaniferous” gas can be once more diluted with carbonic oxide, and passed through a second nickel apparatus.

   • 1948,The Chemical Age, volume59, page43:

     In the first of these articles C. Padovani and E. Gatti discuss the anomalous compressibility of methane andmethaniferous gases when used for auto-traction.

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