We found one dictionary that defines the word phototriode:

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1. phototriode: Wiktionary

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