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The adjective is derived from Middle English moist, moiste [and other forms], from Anglo-Norman moist, moiste, moste, Middle French moiste, and Old French moiste, muste (“damp, moist, wet”) (modern French moite); further etymology uncertain, perhaps a blend of a Late Latin variant of Latin mūcidus (“mouldy, musty”) + a Late Latin derivative of Latin mustum (“unfermented or partially fermented grape juice or wine, must”). The noun is derived from the adjective.

From Middle English moisten, moist, moiste (“to make moist or wet; to soak in liquid; to become moist or wet; to provide with moisture or water; to satisfy thirst with liquor or water, slake”) [and other forms], and then either: * from Anglo-Norman muster (“to make moist or wet”), Middle French moistir, and Old French moistir (“to make moist or wet; to become moist or wet”) (compare enmoistir; modern French moitir), from Old French moiste, muste (“damp, moist, wet”) (see etymology 1) + -ir (suffix forming infinitives of second conjugation verbs); or * from Middle English moist, moiste (adjective) (see etymology 1), though the adjective is first attested later.