vitrain

Etymology

From Latin vitreus (“vitreous”) + -ain in fusain; compare French -ain (“-ane”). Coined by British birth control campaigner and paleontologist Marie Stopes in 1918.

vitrain means A constituent of banded bituminous coal consisting of a horizontal glossy band of friable material. Lexicurio rates it Sui generis — a strength score of 90 out of 100.

noun

A constituent of banded bituminous coal consisting of a horizontal glossy band of friable material.“The caking behaviour of vitrain and clarain could be improved after the coal has been picked out.”