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Hydro (adjective)
hydroelectric
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Hydro (adjective)
hydroponic
“hydro watercress”
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Hydro (noun)
hydroelectric power
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Hydro (noun)
electrical power supply; specifically, electrical power provided by a utility (as a publicly-owned one); payment or bills for this.
“I won’t have lights until my house gets the hydro turned on.”
“She was having trouble paying the hydro.”
“He crashed his car against a hydro pole.”
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Hydro (noun)
A spa.
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Hydra (noun)
Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
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Hydra (noun)
A complex, multifarious problem or situation that cannot be solved easily and rapidly.
Wiktionary