any combustible gaseous mixture formed in the earth's crust and obtained from natural fissures or bored wells.
- 1825  This is undoubtedly the first attempt which has ever been made to apply natural Gas to so extensive and useful a purpose.
- 1897  The first object of special interest passed was a natural gas flow, occurring on the left bank about fifteen miles below the Rapid.
- 1957  It is always a new thrill to see natural gas come to the smaller communities in our province.
- 1966  The lonely Yorkshire moors appear to hold a potential natural gas fortune for Canadian prospectors.