'Mesophloeum' definitions:

Definition of 'Mesophloeum'

From: GCIDE

Mesophloeum \Mes`o*phl[oe]"um\, n. [NL., fr. Gr. me`sos middle + floio`s bark.] (Bot.) The middle bark of a tree; the green layer of bark, usually soon covered by the outer or corky layer, and obliterated. [1913 Webster]