We found one dictionary that defines the word tunnel system:

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1. tunnel system: Encyclopedia

Phrases: Houston tunnel system, more... ▸ Words similar to tunnel system ▸ Usage examples for tunnel system ▸ Idioms related to tunnel system ▸ Wikipedia articles (New!) ▸ Words that often appear near tunnel system ▸ Rhymes of tunnel system ▸ Invented words related to tunnel system