Webster's 1828 Dictionary
QUERCITRON
n.[L. quercus, an oak. ] The bark of the yellow oak, used in dyeing.
Webster's 1913 Dictionary
QUERCITRON
Quer "cit *ron, n. Etym: [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.
Spanish Dictionary
quercitrón
quercitrón nombre masculino Roble tintóreo de América del Norte, de cuya corteza se extrae una materia colorante amarilla .
The Wordsmith Dictionary