ˈbyüˌtān, ̷ ̷ˈ ̷ ̷ noun
( -s )
Etymology: International Scientific Vocabulary but- + -ane
: either of two isomeric flammable easily liquefiable gaseous paraffin hydrocarbons C 4 H 10 obtained usually from petroleum or natural gas and occurring in gasoline and in liquefied petroleum gas:
a. : the normal compound CH 3 CH 2 CH 2 CH 3 used chiefly in making butadiene and as a fuel gas — called also n-butane, normal butane
b. : isobutane