Of or relating to distinctive mixtures of crystalline substances with water (ice), or their formation. Chiefly in "cryohydric point" noun the eutectic point or temperature of a solution of a salt in water. "cryohydric temperature" noun = "cryohydric point".
Late 19th century; earliest use found in Journal of the Chemical Society. From cryohydr- + -ic (perhaps compare -hydric), after French cryohydratique.