The Collaborative International Dictionary of English v.0.48:

Hydric \Hy"dric\, a. [From Hydrogen.] (Chem.)
   Pertaining to, or containing, hydrogen; as, hydric oxide.
   [1913 Webster]

   Hydric dioxide. (Chem.) See Hydrogen dioxide, under
      Hydrogen.

   Hydric oxide (Chem.), water.

   Hydric sulphate (Chem.), hydrogen sulphate or sulphuric
      acid.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hydric
    adj 1: having or characterized by excessive moisture; "a hydric
           habitat" [ant: mesic, xeric]