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Hydra, in astronomy
(Encyclopedia)Hydra, in astronomy, southern constellation lying S of Corvus, Crater, Virgo, Leo, and Cancer. It is a long, slender, winding constellation traditionally depicted as a snake and known also as the Wate...hydra, in zoology
(Encyclopedia)hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish stre...Hydra, in Greek mythology
(Encyclopedia)Hydra, in Greek mythology, many-headed water serpent; offspring of Typhon and Echidna. When one of its heads was cut off, two new heads appeared. The second labor of Hercules was to kill the monster. ...Typhon
(Encyclopedia)Typhon tīfēˈəs [key], in Greek mythology, fierce and monstrous son of Gaea. He was the father of Echidna—a monster half woman and half dragon—and of Cerberus, Hydra, the Sphinx, and the Chimer...Pluto, in astronomy
(Encyclopedia)Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying beyond that of ...Hydra, island, Greece
(Encyclopedia)Hydra, Greece: see Ídhra.gamma-ray astronomy
(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...Vries, Adriaen de
(Encyclopedia)Vries, Adriaen de äˈdrēän də vrēs [key], c.1560–c.1626, Dutch sculptor. Having studied in Florence under Giovanni Bologna, he carried into Bohemia and Germany the influence of the Italian Rena...sting
(Encyclopedia)sting, in zoology, organ found in bees, many wasps, some ants, and in scorpions and sting rays, used defensively as well as to kill or paralyze prey. In the bee and the wasp the venom is produced by g...Ídhra
(Encyclopedia)Ídhra hīˈdrə [key], island, 21 sq mi (54 sq km), SE Greece, in the Aegean Sea, off the Argolís peninsula of the Peloponnesus. It is mostly barren and rocky. Ídhra town is the center of populatio...Browse by Subject
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