py·rochro·ite \ˌpīrəˈkrōˌīt, pīˈräkrəˌwīt\noun (-s) Etymology: Swedish pyrochroit, from pyr- + Greek chrōs color + Swedish -it -ite; from the fact that it becomes colored when heated — more at chromatic : a mineral Mn(OH)2 that is a natural manganous hydroxide