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Noun: water vapor  'wo-tur 'vey-pur
Usage: US (elsewhere: water vapour)
  1. Water in a vaporous form diffused in the atmosphere but below boiling temperature
    "The high humidity was due to excessive water vapor in the air";
    - water vapour [Brit, Cdn]

Derived forms: water vapors

Type of: vapor [US], vapour [Brit, Cdn]

Part of: cloud

Encyclopedia: Water vapor