(astronomy) A faint brightening of the night sky in the region of the ecliptic directly opposite the Sun.

(chemistry, physics) A counterion: an ion of opposite charge to another in an electrochemical or ion transport system.

plural of gegenion

(medicine) paratonia

a region (marz) of the Republic of Armenia

plural of gegenschein

(soccer) A tactic in which a team, after losing possession of the ball, immediately attempts to win back possession, rather than falling back to regroup

present participle of gegenpress

plural of gegger

A surname.