backlight

Short definition from Wiktionary

Noun

1. 1
   Light shining from a source behind the object of interest or attention.
2. 2
   Light shining from a source behind the object of interest or attention: A spotlight that illuminates a photographic subject from behind.
3. 3
   Light shining from a source behind the object of interest or attention: Light that is behind a photographic subject.
4. 4
   Light shining from a source behind the object of interest or attention: A light attached to an LCD display.
5. 5
   The rear window of a motor car.

Verb

1. 1
   To illuminate something from behind.