| Janus |
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proper noun
- (Roman mythology) The god of gates and doorways; having two faces looking in opposite directions
- (astronomy) a moon of Saturn
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| jet stream |
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noun
- (meteorology) any of the high-speed, high-altitude air currents that circle the Earth in a westerly direction
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| Jodrell Bank |
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proper noun - A radio observatory in England.
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| Jovian planet |
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noun
- Either of the four gas giant planets in the Solar System: Jupiter, Uranus, Saturn, or Neptune.
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| Juno |
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proper noun
- The Roman equivalent of the Greeks' Hera, queen of the gods.
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| Jupiter |
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proper noun
- The fifth and by far the largest planet in the Solar System, a gas giant, represented by the symbol � in astronomy. Jupiter is known for its Great Red Spot and many moons including the Galilean moons.
- The Roman King of the Gods, also called Jove. Equivalent to the Greek Zeus, Jupiter was one of the children of Saturn.
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