Definition of mullite
: a mineral that is an orthorhombic silicate of aluminum which is resistant to corrosion and heat and is used as a refractory
Origin of mullite
Mull, island of the Inner Hebrides
First Known Use: 1924
Learn More about mullite
Britannica.com: Encyclopedia article about "mullite"
Seen and Heard
What made you want to look up mullite? Please tell us where you read or heard it (including the quote, if possible).