evection
noun
evec·tion
ə̇ˈvekshən,
ēˈ-
plural -s
1
: perturbation of the moon's motion in its orbit due to the attraction of the sun
2
in certain filamentous algae : displacement of the base of a new branch with respect to its parent cell so as to result in apparent dichotomy
evectional adjective
-shənᵊl
-shnəl
Word History
Etymology
Latin evection-, evectio act of going up, from evectus (past participle of evehere to carry out, raise up, from e- + vehere to carry) + -ion-, -io -ion