Moisture

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late Middle English (denoting moistness): from Old French moistour, from moiste (see moist).

wiktionary

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From Middle English moisture, from Old French moistour(“moisture, dampness, wetness”). Compare French moiteur.

etymonline

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moisture (n.)

"diffused and perceptible wetness," mid-14c., from Old French moistour "moisture, dampness, wetness" (13c., Modern French moiteur), from moiste (see moist).