| 单词 | hydra |
| 释义 | hydra /huy"dreuh/, n. , pl. hydras, hydrae /-dree/ for 1-3, gen. hydrae /-dree/ for 4. 1. (often cap.) Class. Myth. 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. 2. 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. 3. a persistent or many-sided problem that presents new obstacles as soon as one aspect is solved. 4. (cap.) Astron. the Sea Serpent, a large southern constellation extending through 90° of the sky, being the longest of all constellations. [1325-75; < L < Gk hýdra water serpent (r. ME ydre < MF < L); see OTTER] |
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