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in astronomy, one of the natural satellites, or moons, of NeptuneNeptune,
in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolution is about 165 years.
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(lərĭs`ə) or


(lä`rēsä), city (1991 pop. 113,090), capital of Larissa prefecture, E Greece, in Thessaly on the Piniós River. It is an agricultural trade center and a transportation hub, linked by rail with the port of Vólos and with Thessaloníki and Athens. The chief city of ancient Thessaly, it was annexed (4th cent. B.C.) by Philip II of Macedon and in 196 B.C. became an ally of Rome. It was taken from the Byzantine Empire by Bulgaria and later was held by Serbia, with which it passed (15th cent.) under the rule of the Ottoman Turks. In the Greek War of Independence the city was (1821) the headquarters of Ali Pasha. Turkey ceded the city to Greece in 1881.


(lă-riss -ă) A small satellite of Neptune, discovered in 1989. See Table 2, backmatter.


A satellite of Neptune orbiting at a mean distance of 45,700 miles (73,600 kilometers) with a period of 13.3 hours, and with a diameter of about 120 miles (190 kilometers).


, Larissa
a city in E Greece, in E Thessaly: fortified by Justinian; annexed to Greece in 1881. Pop.: 130 000 (2005 est.)