optocoupler/ˈɑptoʊˌkʌplɚ/optocoupler means an optoisolator. Lexicurio rates it Sui generis — a strength score of 87 out of 100.optocoupler is pronounced /ˈɑptoʊˌkʌplɚ/.EtymologyFrom opto- + coupler.nounAn optoisolator.