/ˈθɒrɪk/ (THOR-ik)

Definitions

1. adjective

of or relating to a type of fossil fuel, especially coal, that contains a high percentage of carbon

“The phthoric coal deposits were a significant discovery for the local mining industry.”

2. noun

a type of fossil fuel, especially coal, that contains a high percentage of carbon

“The phthoric was mined extensively in the early 20th century.”