Lexic.us

Definition of Hydra

1. Noun. (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones. "Hydra was slain by Hercules"

2. Noun. A long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer.

3. Noun. Trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality. "We may be facing a hydra that defies any easy solution"

4. Noun. Small tubular solitary freshwater hydrozoan polyp.

Definition of Hydra

1. n. A serpent or monster in the lake or marsh of Lerna, in the Peloponnesus, represented as having many heads, one of which, when cut off, was immediately succeeded by two others, unless the wound was cauterized. It was slain by Hercules. Hence, a terrible monster.

Definition of Hydra

1. a freshwater polyp [n -DRAS or -DRAE]

Medical Definition of Hydra

1. Genus of freshwater coelenterates (cnidarians). They are small, solitary and only exist in the polyp form, which is a radially symmetrical cylinder that is attached to the substratum at one end and has a mouth surrounded by tentacles at the other. They have considerable powers of regeneration and have been used in studies on positional information in morphogenesis. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Hydra

hydatoid Hyde Hyde's disease Hyderabad Hydnaceae Hydnocarpus Hydnocarpus kurzii Hydnocarpus laurifolia hydnocarpus oil hydnocarpus oil

Hydnocarpus wightiana Hydnoraceae Hydnum hydr- Hydra (current term) hydra hydracetin hydrachnid hydracid hydracid

hydracids hydracrylic hydractinian hydradenitis hydradenoma hydrae hydraemia hydraemic oedema hydragog hydragogs

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