(photography) 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.

(photography) Abbreviation of single-lens reflex camera.

(medicine, pathology) A condition of uncontrollable sneezing in response to numerous stimuli, including bright light.

(medicine) A disorder with intense burning pain, one of two types of complex regional pain syndrome.

(clinical psychology) A brief dysphoria just prior to the milk ejection reflex.