1. noun /ˈveɪpə/
2. verb /ˈveɪpə/
a) To become vapor; to be emitted or circulated as vapor.
He vapoured, and fretted, and fumed, and trotted up and down, and tried to make himself pleasing in Miss Holliss big, quiet, grey eyes, and failed.
b) To turn into vapor.
Wikipedia foundation.