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GSS Etymology Practice Test
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Which meaning matches the prefix hydro?
Earth
Water
Blood
Equal
Reveal Answer
Correct Answer:
Water
Explanation:
Hydro- signals water. It comes from the Greek hydōr for water, so terms with this prefix are about water or fluids. That’s why it best matches water in the list, as seen in words like hydroelectric (powered by water), hydrotherapy (treatment using water), and hydroponics (growing plants in water-based solutions). The other ideas don’t fit because they come from different roots: earth is geo- (as in geology), blood is hemo-/haemo- (as in hematology or hemodynamics), and equal is iso- (as in isometric or isotherm).
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