Meaning of antihalation

an•ti•ha•la•tion

Pronunciation: (an"tē-hā-lā'shun, -ha-, an"tī-), [key]
— Photog. Photog.
—n.
  1. the process of treating a film base with a light-absorbing substance to prevent refraction of light from the rear of the film.
—adj.
  1. resistant to halation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.