We found one dictionary that defines the word microtrench:

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1. microtrench: Wiktionary

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