English

geoeffective

From geo- + effective.

Proto-Hellenic *gaya

Ancient Greek γῆ ‘earth’

English geo-

Latin efficiō ‘to make; bring about’

Latin effectīvus ‘productive; effective’

French effectif ‘effective’

Today it means

adj Capable of causing a geomagnetic disturbance

Language periods are conventional ranges, not dates for this word.

Etymograph / geoeffective