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meteor  n 
1 a very small meteoroid that has entered the earth's atmosphere. Such objects have speeds approaching 70 kilometres per second 
2  (Also called)  shooting star, falling star the bright streak of light appearing in the sky due to the incandescence of such a body heated by friction at its surface 
 (C15: from Medieval Latin meteorum, from Greek meteoron something aloft, from meteoros lofty, from meta- (intensifier) + aeirein to raise) 
meteor shower    n 
a transient rain of meteors, such as the Perseids, occurring at regular intervals and coming from a particular region in the sky. It is caused by the earth passing through a large number of meteoroids (a meteor swarm)