Source : Webster's Revised Unabridged Dictionary (1913)

Quercitron \Quer"cit*ron\, n. [F. quercitron, the name of the
   name of tree; L. quercus an oak + citrus the citron tree.]
   1. The yellow inner bark of the {Quercus tinctoria}, the
      American black oak, yellow oak, dyer's oak, or quercitron
      oak, a large forest tree growing from Maine to eastern
      Texas.

   2. Quercitrin, used as a pigment. See {Quercitrin}.

Source : WordNet®

quercitron
     n 1: a yellow dye made from the bark of the quercitron oak tree
     2: medium to large deciduous timber tree of the eastern United
        States and southeastern Canada having dark outer bark and
        yellow inner bark used for tanning; broad 5-lobed leaves
        are bristle-tipped [syn: {black oak}, {yellow oak}, {quercitron
        oak}, {Quercus velutina}]