单词 | Neptune |
释义 | Nep·tune ![]() n. 1. a. 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 equatorial diameter of 49,528 kilometers (30,775 miles), and a mass 17.25 times that of Earth. [Latin Neptūnus.] Nep·tuni·an (-tnē-ən, -ty-) adj. ![]() top:the Roman god bottom: the planet Neptune ![]() |
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