Dictionary.net

• 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

2006 - WordNet 3.0
By Princeton University

• 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

2011 - English Dictionary Database
By DataStellar Co., Ltd