- The definition of humid is there is a lot of water vapor in the air.
When the air feels wet, heavy and sticky, this is an example of when it is humid.
Origin: Fr humide from Classical Latin humidus from humere, altered (after humus) from umere, to be moist: see humor
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Origin: Middle English, from Latin hūmidus, from hūmēre, to be moist.
- huˈmid·ly adverb