资料来源 : pyDict

照相底片上显现的光轮状晕,晕光,白色模糊影像

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Halation \Ha*la"tion\ (h[asl]*l[=a]"sh[u^]n), n. (Photog.)
   An appearance as of a halo of light, surrounding the edges of
   dark objects in a photographic picture.