vapours vapours /ˈveɪpəz/

noun

1. [Canadian, British] A state of depression  ( blue devils , blues , megrims , vapors [American] , vapours [Canadian, British] )
   a state of depression
    He had a bad case of the blues
   he had a bad case of the blues
   

 vapour vapour /ˈveɪpər/

noun

1. [Canadian, British] The process of becoming a vapor  ( vaporisation [British] , vaporization , vapour [Canadian, British] , evaporation , vapor [American] )
   the process of becoming a vapor
     The sun's heat caused the evaporation of water from the surface of the lake.
   The sun's heat caused the evaporation of water from the surface of the lake.
   
   
2. [Canadian, British] A visible suspension in the air of particles of some substance  ( vapour [Canadian, British] , vapor [American] )
   a visible suspension in the air of particles of some substance
    As the morning fog cleared, a light vapor could still be seen hanging over the lake.
   As the morning fog cleared, a light vapor could still be seen hanging over the lake.