lignite
n.
"imperfectly formed coal," 1808, from French, from Latin lignum "wood" (see ligni-). Brown coal that still shows traces of the wood it once was. Probably directly from Lithanthrax Lignius, name given to woody coal by Swedish chemist Johan Gottschalk Wallerius (1709-1785) in 1775.
〔李〕[lign =wood木；-ite ⇒“a fossil of wood木的化石”→] n. brown coal褐煤