
1) Tree with extra-large acorns 2) Tree yielding large acorns
Found on
https://www.crosswordclues.com/clue/bur-oak

(Quercus macrocarpa), North American timber tree belonging to the white oak group of the genus Quercus in the beech family (Fagaceae), distributed ...
Found on
http://www.britannica.com/eb/a-z/b/129

[
n] - medium to large deciduous oak of central and eastern North America with ovoid acorns deeply immersed in large fringed cups
Found on
http://www.webdictionary.co.uk/definition.php?query=bur%20oak
burr oak noun 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
Found on
https://www.encyclo.co.uk/local/20974

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.
Found on
https://www.infoplease.com/dictionary/bur-oak

Bur Oak (Quercus macrocarpa) Common Name(s): Bur Oak, Burr Oak, Mossycup Oak Scientific Name: Quercus macrocarpa Distribution: Eastern and Midwestern United States and south-central Canada Tree Size: 80-100 ft (24-30 m) tall, 3-5 ft (1-1.5 m) trunk diameter Average Dried Weight: 45 lbs/ft
3 (72...
Found on
https://www.wood-database.com/bur-oak/
No exact match found.