Etymology
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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.

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Definitions of lignite

lignite (n.)
intermediate between peat and bituminous coal;
Synonyms: brown coal / wood coal
From wordnet.princeton.edu