The Collaborative International Dictionary
Lignitic
Lignitic \Lig*nit"ic\ (l[i^]g*n[i^]t"[i^]k), a. Containing lignite; resembling, or of the nature of, lignite; as, lignitic clay.
Lignitic group. See Laramie Group.
Wiktionary
lignitic
a. Containing or resembling lignite.