bac·te·ri·o·rho·dop·sin 
(băk-tîr′ē-ō-rō-dŏpsĭn)
(băk-tîr′ē-ō-rō-dŏpsĭn)n.
A pigmented membrane protein found in extremely halophilic archaea of the genus Halobacterium that converts light energy to chemical energy and is structurally similar to rhodopsin.