a vane on a seaplane conferring stability on water (a sponson) or facilitating take off (a hydrofoil)


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  • Hydrovarium

    hydrovarium hy·dro·var·i·um (hī’drō-vâr’ē-əm) n. The accumulation of fluid in the ovary.

  • Hydroxide

    [hahy-drok-sahyd, -sid] /haɪˈdrɒk saɪd, -sɪd/ noun 1. a chemical compound containing the hydroxyl group. /haɪˈdrɒksaɪd/ noun 1. a base or alkali containing the ion OH– 2. any compound containing an -OH group n. 1851, from hydro- + oxide. hydroxide hy·drox·ide (hī-drŏk’sīd’) n. A chemical compound containing the hydroxyl group, especially one that releases a hydroxyl […]

  • Hydroxide-ion

    noun 1. the anion OH−.

  • Hydroxonium ion

    /ˌhaɪdrɒkˈsəʊnɪəm/ noun 1. a positive ion, H3O+, formed by the attachment of a proton to a water molecule: occurs in solutions of acids and behaves like a hydrogen ion Also called hydronium ion

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