A prefix or standalone noun relating to water; also short for hydroelectric power or a therapeutic water-based treatment.
From Greek 'hydro-' meaning 'water,' from 'hydōr.' In modern usage, it became a standalone abbreviation for hydroelectric power stations, particularly in Canada and Australia.
Canada calls their power utilities 'Hydro'—which is perfect because nearly 60% of their electricity comes from water power—but the word perfectly reveals how Greek roots dominate modern science vocabulary.
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