| 单词 | volvelle | 
| 释义 | volvelle in American English (ˈvɑlvel) noun Astronomy  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  Word origin  [1400–50; late ME ‹ ML volvella, equiv. to L volv(ere) to turn + -ella -elle] | 
	
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