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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

: a useful and ornamental oak (Quercus macrocarpa) of central and eastern No. America with ovoid acorns enclosed in very large fringed cups and tough close-grained durable wood — called also mossy-cup oak

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.

[1805-15, Amer.]

bur oak,

1. a hardy North American oak tree whose acorns have large, fringed cups covered with scales.

2. its hard, tough, close-grained wood.

n. a North American oak, with large fringed acorn cups. Its timber was formerly important in shipbuilding. Also called mossycup oak. ● Quercus macrocarpa, family Fagaceae