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.

• a yellow dye obtained from the bark of the black oak
  
• the black oak tree, Quercus velutina, indigenous to North America