acorn - fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base

genus Quercus, Quercus - oaks

oak - the hard durable wood of any oak; used especially for furniture and flooring

live oak - any of several American evergreen oaks

white oak - any of numerous Old World and American oaks having 6 to 8 stamens in each floret, acorns that mature in one year and leaf veins that never extend beyond the margin of the leaf

European turkey oak, Quercus cerris, turkey oak - large deciduous tree of central and southern Europe and Asia Minor having oblong-lanceolate leaves with spiked lobes

Quercus coccinea, scarlet oak - medium-large deciduous tree with a thick trunk found in the eastern United States and southern Canada and having close-grained wood and deeply 7-lobed leaves turning scarlet in autumn

northern pin oak, Quercus ellipsoidalis, jack oak - small to medium deciduous oak of east central North America; leaves have sharply pointed lobes

red oak - any of numerous American oaks having 4 stamens in each floret, acorns requiring two years to mature and leaf veins usually extending beyond the leaf margin to form points or bristles

evergreen oak, holly-leaved oak, holm tree, Quercus ilex, holm oak - evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood

Quercus imbricaria, shingle oak, laurel oak - small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles

bluejack oak, Quercus incana, turkey oak - small semi-evergreen shrubby tree of southeastern United States having hairy young branchlets and leaves narrowing to a slender bristly point

California black oak, Quercus kelloggii - large deciduous tree of the Pacific coast having deeply parted bristle-tipped leaves

American turkey oak, Quercus laevis, turkey oak - small slow-growing deciduous shrubby tree of dry sandy barrens of southeastern United States having leaves with bristle-tipped lobes resembling turkey's toes

laurel oak, Quercus laurifolia, pin oak - large nearly semi-evergreen oak of southeastern United States; thrives in damp soil

overcup oak, Quercus lyrata - medium-large deciduous timber tree of central and southern United States; acorns deeply immersed in the cup and mature in first year

scrub oak - any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets

Japanese oak, Quercus grosseserrata, Quercus mongolica - oak with moderately light fine-grained wood; Japan

chestnut oak - an oak having leaves resembling those of chestnut trees

possum oak, Quercus nigra, water oak - relatively tall deciduous water oak of southeastern United States often cultivated as a shade tree; thrives in wet soil

Nuttall oak, Nuttall's oak, Quercus nuttalli - similar to the pin oak; grows in damp sites in Mississippi River basin

pin oak, Quercus palustris, swamp oak - fast-growing medium to large pyramidal deciduous tree of northeastern United States and southeastern Canada having deeply pinnatifid leaves that turn bright red in autumn; thrives in damp soil

Quercus phellos, willow oak - medium to large deciduous oak of the eastern United States having long lanceolate leaves and soft strong wood

box white oak, brash oak, iron oak, post oak, Quercus stellata - small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts

cork oak, Quercus suber - medium-sized evergreen oak of southern Europe and northern Africa having thick corky bark that is periodically stripped to yield commercial cork

Quercus texana, Spanish oak - small deciduous tree having the trunk branched almost from the base with spreading branches; Texas and southern Oklahoma

Chinese cork oak, Quercus variabilis - medium to large deciduous tree of China, Japan, and Korea having thick corky bark

black oak, quercitron oak, Quercus velutina, yellow oak, quercitron - medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad 5-lobed leaves are bristle-tipped