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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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