| 单词 | volvelle |
| 释义 | volvelle /vol"vel/, n. Astron. a medieval instrument consisting of a series of concentric rotating disks, used to compute the phases of the moon and its position in relation to that of the sun. [1400-50; late ME < ML volvella, equiv. to L volv(ere) to turn + -ella -ELLE] |
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