firemountain

plural firemountains

1. rareRare spelling of fire mountain.

   "[You are] firemountain-glass, Dama." He says this very softly. "You're a gift of the earth—for Father Earth hates us, [...and...] If we pick you up, hone you to sharpness, [you will still be dangerous]. [Later, in the glossary:] Blow: A volcano. Also called firemountains in some Coastal langu ages.

   2015, N. K. Jemisin, The Fifth Season

   1 more example

   "I have heard that firemountains at times belch out such dust, […]" […] "Tell me, Bekki, what causes firemountains to spew?” Bekki shrugged. “I know not, though some have said the earth shudders when firemountains roar, yet whether the shudder causes the roaring or the roaring causes the shudder, I cannot say."

   1999, Dennis L. McKiernan, Into the Fire, page 151