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Meaning of bur oak

bur' oak"

Pronunciation: [key]
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.