inflammable air

from The Collaborative International Dictionary of English v.0.48

Inflammable \In*flam"ma*ble\, a. [CF. F. inflammable.]
   1. Capable of being easily set fire; easily enkindled;
      combustible; as, inflammable oils or spirits.
      [1913 Webster]

   2. Excitable; irritable; irascible; easily provoked; as, an
      inflammable temper.
      [1913 Webster]

   {Inflammable air}, the old chemical name for hydrogen.
      [1913 Webster]