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plan·et

planet

 
 
pronunciation:
plae niht
features:
Word History, Word Explorer
part of speech: noun
definition: a large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system.
 
similar words:
world
Word History
The word planet entered English eight hundred years ago, during the Middle Ages. "Planet" comes from the ancient Greek term asteres planetai or "wandering stars." In 1640, astronomers began using the word "planet" in its modern sense of a body that circles a star (the sun).
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  earth