Definition of "hydro"

hydro

adjective
not comparable
1. Clipping of hydroelectric.
2. Clipping of hydroponic.
3. Alternative form of hydro- (“water”)
noun
countable and uncountable, plural hydros
1. (uncountable) Clipping of hydropower; hydroelectric power
2. (uncountable) Clipping of hydroelectricity.
3. (Canada, uncountable) electrical power supply; specifically, electrical power provided by a utility (as a publicly-owned one); payment or bills for this.
4. (Britain, countable, dated) A spa.
  Quotations
  She almost lived at hotels and hydros, last year, but that isn't pleasant for her.
  1909, Rudyard Kipling, The House Surgeon
5. (countable, aviation, obsolete) Abbreviation of hydroaeroplane.
6. Alternative form of hydro- (“water”)
  Quotations
  For the sheer pleasure of speed, the aqua, or hydro, karts probably have all fun craft beat.
  1965, Field & Stream, page 98
  You can also use sound healing, aromatherapy, massage, breath work, herbal and hydro therapies, and guided meditation for mind/body healing.
  2016, Meera Lester, “Stimulate Your Mind with New Challenges”, in The Law of Attraction Made Easy: More Than 50 Exercises to Manifest the Life You Want, Adams Media, page 104
  Those members also get unlimited tanning, half-priced drinks and hydro and chair massages.
  2017 May 6, Carrie Rengers, “Planet Fitness to open fifth Wichita gym”, in The Wichita Eagle, volume 145, number 126, Wichita, Kan., page 9A, columns 3–4