hot Jupiter definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various extrasolar planets that are large and gaseous like Jupiter, but are much hotter and in a very close orbit with a star.
hot jupiter - Science Definition
See under extrasolar planet.