hāˈlāshən, hə-, ha- noun
( -s )
Etymology: halo + -ation
1. : the spreading of light beyond its proper boundaries in a developed photographic image (as around a window facing the sky in an interior view or around other bright objects) caused principally by reflection from the back of the film or plate
2. : a bright ring that sometimes encompasses the point at which a bright light shows on a television screen