| 1. |
(noun) small tubular solitary freshwater hydrozoan polyp |
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Related Words: hydroid, hydrozoan |
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| 2. |
(noun) a long faint constellation near the equator stretching between Virgo and Cancer |
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Synonyms: Snake |
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Related Words: constellation |
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| 3. |
(noun) (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; "Hydra was slain by Hercules" |
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Related Words: mythical creature, mythical monster |
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