ˈpen.ˌtān noun
( -s )
Etymology: International Scientific Vocabulary penta- + -ane
: any of three isomeric paraffin hydrocarbons C 5 H 12 found in petroleum and natural gas:
a. : the volatile flammable liquid normal hydrocarbon CH 3 CH 2 CH 2 CH 2 CH 3 used chiefly in gasoline, in organic synthesis, and as a solvent — called also n-pentane, normal pentane
b. : isopentane
c. : neopentane