We found one dictionary that defines the word mini black hole:

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1. mini black hole: Wiktionary

Definitions from Wiktionary (mini black hole) ▸ noun:  Synonym of micro black hole ▸ Words similar to mini black hole ▸ Usage examples for mini black hole ▸ Idioms related to mini black hole ▸ Wikipedia articles (New!) ▸ Words that often appear near mini black hole ▸ Rhymes of mini black hole ▸ Invented words related to mini black hole