Galvanotropism :: Galvanotropism (n.) The tendency of a root to place its axis in the line of a galvanic current.
Hydrogalvanic :: Hydrogalvanic (a.) Pertaining to, produced by, or consisting of, electricity evolved by the action or use of fluids; as, hydrogalvanic currents..
Photogalvanography :: Photogalvanography (n.) The art or process of making photo-electrotypes.