hydro
adjective
1. hydroelectric
noun
1. (uncountable) hydroelectric power
2. (Canada, uncountable) electrical power supply; specifically electrical power provided by a utility (as a publicly-owned one).
- I won't have lights until my house gets the hydro turned on.
3. (Britain, countable, dated) A spa.
4. (countable, aviation, obsolete) Abbreviation of hydroaeroplane.