This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To make or become moist.

v. To make moist or moister.

v. To become moist or moister.

v. To make damp; to wet in a small degree.

v. To soften by making moist; to make tender.

To become moist.

To make moist or damp; wet superficially or in a moderate degree.

To soften; make tender.

v. moisten with fine drops

v. make moist

""moisten" not (the earth). smite ... with all plagues -- Greek, "with (literally, 'in') every plague.""

dry   

moistened    moistening    moistens   

splosh    splash    sprinkle   

moistened    moistening   

speck    wet    bemoist    dampen    damp    humidify    baste    dew    sponge   

moist    till    flavored    sticky    clench    whiten    char    sodden    bleach    damp