We found one dictionary that defines the word opto-interrupter:

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1. opto-interrupter: Wiktionary

Definitions from Wiktionary (opto-interrupter) ▸ noun:  (electronics) A photointerrupter. ▸ Words similar to opto-interrupter ▸ Usage examples for opto-interrupter ▸ Idioms related to opto-interrupter ▸ Wikipedia articles (New!) ▸ Popular adjectives describing opto-interrupter ▸ Words that often appear near opto-interrupter ▸ Rhymes of opto-interrupter ▸ Invented words related to opto-interrupter