electro-optical adjective elec·tro-op·ti·cal \ i-ˌlek-trō-ˈäp-ti-kəl \ variants: or electro-optic play \i-ˌlek-trō-ˈäp-tik\ Trending Now: More Trending: charlatan lowlife kakistocracy slimeball salacious SEE ALL See What's Trending Now See More Trending Words What's Trending Now More Trending Words charlatan 'faker or fraud' lowlife 'a person of low moral character' kakistocracy 'government by the worst people' slimeball 'a morally repulsive or odious person' salacious 'arousing or appealing to sexual desire' SEE ALL Time Traveler! Explore the year a word first appeared Definition of electro-optical 1 : of or relating to electro-optics 2 a : relating to or being a change in the refractive index of a material due to an electric field electro-optical effect b : using or being a material that exhibits electro-optical properties an electro-optical crystal 3 : relating to or being an electronic device for emitting, modulating, transmitting, or sensing light — electro-optically play \i-ˌlek-trō-ˈäp-ti-k(ə-)lē\ adverb First Known Use of electro-optical 1850 in the meaning defined at sense 1 See Words from the same year NEW! Time Traveler Seen and Heard What made you want to look up electro-optical? Please tell us where you read or heard it (including the quote, if possible). show hide