California Registered Dental Assistant (RDA) Written Practice Exam

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What does 'hydro-' mean?

Air
Earth
Water
Fire

The correct answer is: Water

'Hydro-' is a prefix that is derived from the Greek word 'hydor', meaning "water." Therefore, 'hydro-' refers to anything related to water such as hydroelectricity, hydrophobic, or hydrotherapy. Option A, air, and option D, fire, have their own respective prefixes 'aero-' and 'pyro-' and are not related to 'hydro-'. Option B, earth, may potentially be confused with 'hydro-' since water is found on earth, but the prefix for earth is actually 'geo-'. So, option C is the only one that accurately defines the meaning of 'hydro-'.