Meaning of “moist” - Learner’s Dictionary

moist

adjective uk us /mɔɪst/

slightly wet:

Keep the soil moist but not wet.
It was a lovely, moist cake.
moisten uk us /ˈmɔɪsən/ verb [ I, T ]

to make something slightly wet, or to become slightly wet

(Definition of “moist” from the Cambridge Learner’s Dictionary © Cambridge University Press)