humid

The word 'humid' entered English in the late Middle English period from the Old French humide, which itself was derived from the Latin humidus (moist, wet). This Latin adjective stems from the verb humere, meaning 'to be moist'. The core root can be traced further back to the Proto-Indo-European base wegʷ- meaning "wet", which also gave rise to words like 'water' via a different Germanic branch. The logic of the word is direct: the morpheme 'hum' carries the ancient sense of moisture, and the suffix '-id' forms an adjective describing something characterized by that moisture, perfectly capturing the modern meaning of damp air.

Structure: hum (moist) + id (adjective suffix) - hum: From Latin humidus, from humere (to be moist). The root is hum-, meaning moist or wet. - id: A Latin adjectival suffix meaning "having the quality of; in a state of".