Astronomy. (The name of) a hypothetical planet postulated to have its orbit between the sun and Mercury. Now historical.
| 单词 | θ555 |
| 释义 | the world > the universe > planet > primary planet > inferior planet > [noun] > Vulcan (1) Vulcan1860 Astronomy. (The name of) a hypothetical planet postulated to have its orbit between the sun and Mercury. Now historical. |
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