UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈprəʊpeɪn/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈproʊpeɪn/ ,USA pronunciation: respelling(prōpān)

WordReference Random House Learner's Dictionary of American English © 2020
pro•pane /ˈproʊpeɪn/USA pronunciation   n. [uncountable]
  1. Chemistrya colorless gas that easily ignites, occurs in petroleum and natural gas, and is used chiefly as a fuel.

WordReference Random House Unabridged Dictionary of American English © 2020
pro•pane  (prōpān),USA pronunciation n. [Chem.]
  1. Chemistrya colorless, flammable gas, C3H8, of the alkane series, occurring in petroleum and natural gas: used chiefly as a fuel and in organic synthesis. Also called  dimethylmethane. 
  • prop(ionic) + -ane 1866

Collins Concise English Dictionary © HarperCollins Publishers::
propane /ˈprəʊpeɪn/ n
  1. a colourless flammable gaseous alkane found in petroleum and used as a fuel. Formula: CH3CH2CH3
Etymology: 19th Century: from propionic acid + -ane
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