single lens reflex

Short definition from Wiktionary

Noun

1. 1
   Alternative form of single-lens reflex.
2. 2
   Clipping of single-lens reflex camera.

Adjective

1. 1
   Alternative form of single-lens reflex.
2. 2
   Denoting or relating to a type of camera which allows the photographer to view the subject through the same lens that will be used to take a photograph, usually by incorporating a moving mirror and prism.