Definition of Mapp gas in English:

Mapp gas

(also mapp gas, MAPP Gas, Mapps gas)

noun

US
  • A trademark for: a liquefied mixture of methyl acetylene and other hydrocarbon gases which is used as a fuel, especially in blowtorches.

Origin

1960s; earliest use found in The Official Gazette. Origin of first element uncertain; perhaps from m- + a- + p…p- + gas [adjective].

Pronunciation

Mapp gas

/ˈmap ɡas/