define moisture
moisturenoun [ U ] uk â /ËmÉÉªs.tÊÉr/ us â /ËmÉÉªs.tÊÉ/. âº a liquid such as water in the form of very small drops, either in the air, in a substance, or on a surface: These plants need a rich soil that retains moisture. Thesaurus: synonyms and related words. Precipitation: clouds, dew, fog & steam. altocumulus.