| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| Neptune |
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| SYLLABICATION: | Nep·tune |
| PRONUNCIATION: |  n p t n , -tyn |
| NOUN: | 1a. Roman Mythology The god of water, later identified with the Greek Poseidon. b. The sea. 2. The eighth planet from the sun, having a sidereal period of revolution around the sun of 164.8 years at a mean distance of 4.5 billion kilometers (2.8 billion miles), a mean radius of 24,000 kilometers (15,000 miles), and a mass 17.2 times that of Earth. | | ETYMOLOGY: | Latin Nept nus. | | OTHER FORMS: | Nep·tuni·an (-tn - n, -ty-) —ADJECTIVE
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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