• (n.) A variety of lignin or cellulose found in the medulla, or pith, of certain plants. Cf. Lignin, and Cellulose.
Me·dul'lin noun [ Confer French médulline .] (Bot. Chem.) A variety of lignin or cellulose found in the medulla, or pith, of certain plants. Confer Lignin , and Cellulose .