Definition of mullitization in US English:

mullitization

noun

Mineralogy Ceramics
  • Conversion into mullite; the degree to which a substance has been converted into mullite.

Origin

1930s; earliest use found in Ceramic Abstracts. From mullite + -ization.

Pronunciation

mullitization

/ˌmʌlɪtʌɪˈzeɪʃn/