Meaning
A constituent of banded bituminous coal consisting of a horizontal glossy band of friable material.
Etymology
Origin: Latin
From Latin vitreus (“vitreous”) + -ain in fusain; compare French -ain (“-ane”). Coined by British birth control campaigner and paleontologist Marie Stopes in 1918.
NYT Puzzle Appearances
No published puzzle dates on file for this word yet. It is part of the official NYT Spelling Bee word list for 2019, 2020, 2023, 2024, 2025, 2026.