One of the mysteries of the English language finally explained.
A trademark for: a liquefied mixture of methyl acetylene and other hydrocarbon gases which is used as a fuel, especially in blowtorches.
1960s; earliest use found in The Official Gazette. Origin of first element uncertain; perhaps from m- + a- + p…p- + gas [adjective].
Mapp gas/ˈmap ɡas/
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