n. [ Hydro-, 1 + meteor. ] A meteor or atmospheric phenomenon dependent upon the vapor of water; -- in the pl., a general term for the whole aqueous phenomena of the atmosphere, as rain, snow, hail, etc. Nichol. [ 1913 Webster ]

a. Of or pertaining to hydrometeorology, or to rain, clouds, storms, etc. [ 1913 Webster ]

n. [ Hydro-, 1 + meteorology. ] That branch of meteorology which relates to, or treats of, water in the atmosphere, or its phenomena, as rain, clouds, snow, hail, storms, etc. [ 1913 Webster ]