1. [Brit] A health spa 
2. [Cdn] Electricity from a utility company
   "the rent doesn't include hydro" 
3. Hydroelectric power
   - hydropower

1. (chemistry) hydrogen
   - hydr- 
2. Water
   - hydr-

Derived forms: hydros

Encyclopedia: Hydro Hydro, OK Hydro, Oklahoma

• grade separation
• grade-appropriate
• grade-constructed
• graded
• grader
• gradient
• grading
• gradual
• gradualism
• graduality
• gradually
• gradualness
• graduand
• graduate
• graduate nurse
• graduate school
• graduate student
• graduated
• graduated cylinder
• graduated table
• graduated tax
• graduating class
• graduation
• graduation exercise
• Graecise