Medullin
Pronunciation : Me*dul"lin
Part of Speech : n.
Etymology : [Cf. F. m?dulline.] (Bot. Chem.)
Definition : Defn: A variety of lignin or cellulose found in the medulla, or pith, of certain plants. Cf. Lignin, and Cellulose.
Source : Webster's Unabridged Dictionary, 1913