evection

evection

[ih-vek-shuhn]
noun Astronomy.
a periodic irregularity in the moon's motion, caused by the attraction of the sun.

Origin:
1650–60; < Latin ēvectiōn- (stem of ēvectiō) a going upwards, flight, equivalent to ēvect(us) (past participle of ēvehere to carry forth, move forth) + -iōn- -ion

evectional, adjective
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World English Dictionary
evection (ɪˈvɛkʃən)
 
n
irregularity in the moon's motion caused by perturbations of the sun and planets
 
[C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry]
 
e'vectional
 
adj

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