In cold weather, we get water vapour coming out of the mouth as we breathe. What is that called?
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This is simply called "breath", with no special word for the visible form. We often call this phenomenon "seeing one's breath":
I would call that steam (definition 2b from m-w.com: the mist formed by the condensation on cooling of water vapor); even though it is most commonly associated with boiling, the word can be applied to any vapor created due to a heat differential.
(one example from the definition page: Their breath steamed the windows.)
protected by Rathony Apr 28 at 14:33
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