- 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.
humid definition by Webster's New World
Origin: French humide ; from Classical Latin humidus ; from humere, altered (after humus) ; from umere, to be moist: see humor
humid definition by American Heritage Dictionary
Origin: Middle English, from Latin hūmidus, from hūmēre, to be moist.
- huˈmid·ly adverb