• Noun, plural -dras, -drae

    ( often initial capital letter ) Classical Mythology . a water or marsh serpent with nine heads, each of which, if cut off, grew back as two; Hercules killed this serpent by cauterizing the necks as he cut off the heads.
    any freshwater polyp of the genus Hydra and related genera, having a cylindrical body with a ring of tentacles surrounding the mouth, and usually living attached to rocks, plants, etc., but also capable of detaching and floating in the water.
    a persistent or many-sided problem that presents new obstacles as soon as one aspect is solved.
    ( initial capital letter ) Astronomy . the Sea Serpent, a large southern constellation extending through 90? of the sky, being the longest of all constellations.
    Lấy từ « http://tratu.soha.vn/dict/en_en/Hydra »

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