hydremia, hydraemia 1. A blood disorder in which there is excess fluid volume (of water) compared with the cell volume of the blood. 2. The excessive dilution of the blood, so that the proportion of serum to corpuscles is excessive. 3. A condition in which the blood volume is increased as a result of an increase in the water content of plasma, wi... Found on http://www.wordinfo.info/words/index/info/view_unit/1009/3