mesic1Pronunciation: /ˈmiːzɪk, ˈmɛzɪk/Definition of mesic adjective Ecology (of an environment or habitat) containing a moderate amount of moisture: mesic tundrasCompare with hydric and xeric.Origin: 1920s: from Greek mesos 'middle' + -icmesic in other Oxford dictionaries Definition of mesic in the US English dictionary