oak, oak tree

a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns"

• 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, turkey oak, Quercus cerris — large deciduous tree of central and southern Europe and Asia Minor having oblong-lanceolate leaves with spiked lobes
• scarlet oak, Quercus coccinea — 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
• jack oak, northern pin oak, Quercus ellipsoidalis — 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
• holm oak, holm tree, holly-leaved oak, evergreen oak, Quercus ilex — evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood
• shingle oak, laurel oak, Quercus imbricaria — 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, turkey oak, Quercus incana — 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, turkey oak, Quercus laevis — 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, pin oak, Quercus laurifolia — 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 mongolica, Quercus grosseserrata — oak with moderately light fine-grained wood; Japan
• chestnut oak — an oak having leaves resembling those of chestnut trees
• water oak, possum oak, Quercus nigra — 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, swamp oak, Quercus palustris — 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
• willow oak, Quercus phellos — medium to large deciduous oak of the eastern United States having long lanceolate leaves and soft strong wood
• post oak, box white oak, brash oak, iron 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
• Spanish oak, Quercus texana — 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, yellow oak, quercitron, quercitron oak, Quercus velutina — 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

• tree — a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms

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

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

• Quercus, genus Quercus — oaks