Entry 2 senses Webster, 1913 Moisten /mois'-ən/ · Mois·ten · IPA /ˈmɔɪsən/ 01 v. t. To make damp; to wet in a small degree. imp. & p. p. Moistened; p. pr. & vb. n. Moistening 1. To make damp; to wet in a small degree. “A pipe a little moistened on the inside.” — Bacon. 2. To soften by making moist; to make tender. “It moistened not his executioner's heart with any pity.” — Fuller.