IPA: /ʌnˈkæl.saɪnd/
KK: /ʌnˈkæl.saɪnd/
Not having undergone the process of calcination, which is the heating of a substance to high temperatures to bring about thermal decomposition or phase transition.
The uncalcined material was not suitable for the production of high-quality ceramics.
Uncalcined → It is formed from "un-" (meaning not) and "calcined" (from Latin "calcinare", meaning to heat or to burn). The word "uncalcined" refers to a substance that has not been subjected to the process of heating or burning to remove moisture or impurities.
Think of 'not' ('un-') having been 'heated' ('calcined') — that's why uncalcined means something that hasn't been heated.