We found one dictionary that defines the word mullitize:

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1. mullitize: Wiktionary

Definitions from Wiktionary (mullitize) ▸ verb:  To convert into mullite. ▸ Words similar to mullitize ▸ Usage examples for mullitize ▸ Idioms related to mullitize ▸ Wikipedia articles (New!) ▸ Words that often appear near mullitize ▸ Rhymes of mullitize ▸ Invented words related to mullitize