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bur oak, burr oak, mossy-cup oak, mossycup oak, Quercus macrocarpa | medium to large deciduous oak of central and eastern North America with ovoid acorns deeply immersed in large fringed cups; medium to large deciduous oak of central and eastern North America with ovoid acorns deeply immersed in large fringed cups; yields tough close-grained wood ❲Quercus macrocarpa❳ |