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bur oak

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noun
an oak tree, Quercus macrocarpa, of eastern North America, having shiny, dark-green leaves, light-gray deeply ridged bark, and very large acorns with a fringed cup, yielding a hard, durable wood: the state tree of Illinois.
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Origin of bur oak

An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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British Dictionary definitions for bur oak

bur oak

noun
an E North American oak, Quercus macrocarpa, having fringed acorn cups and durable timber
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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