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Entry 2 senses Webster, 1913

Hydro

/hīd'-rōˌ/ · Hy·dro · IPA /ˈhaɪdro/
01 n. A hydro-aëroplane.
  1. 1.
    A hydro-aëroplane.[obsolescent]
  2. 2.
    hydroelectric power; -- also used attributively.