A device that increases the moisture content in the air of a room or building.
From Latin 'humidus' (moist) + English '-ifier' (that which makes). 'Humidus' comes from 'humere' (to be moist), related to 'humus' (earth/soil) - the connection being that moist earth was the standard for measuring dampness. The suffix '-ify' comes from Latin 'facere' (to make), so a humidifier literally 'makes humid' the way earth naturally holds moisture.
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