The prefix hemo - derived from the Greek word haima haimatos which means blood. Why all the words prefix hemo - have to do with the blood, such as hemodialysis, hematoma, erythrocytes, hematology...The hydraulic - or hydro prefix derives from hydor hydatos which means water. form words such as hydrogen, Hydrophobia, hydration, carbohydrates, Mead...The prefix hiper-deriva of the adverb and the Greek preposition hyper meaning upon, up, more, more. Words with this prefix denote superiority or excess, such as hypertension, Hyperglycemia, farsightedness, hyper, hyperoxia, hyperplasia, hypertrophy...