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|Noun||1.||jack oak - a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets|
scrub oak - any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets
|2.||jack oak - small to medium deciduous oak of east central North America; leaves have sharply pointed lobes|