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.
Historical Examples

Heroes of To-Day Mary R. Parkman

an E North American oak, Quercus macrocarpa, having fringed acorn cups and durable timber

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