jack oak

Noun jack oak has 2 senses

• jack oak(n = noun.plant) blackjack, blackjack oak, quercus marilandica - 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;
is a kind of scrub oak

• jack oak(n = noun.plant) northern pin oak, quercus ellipsoidalis - small to medium deciduous oak of east central North America; leaves have sharply pointed lobes;
is a kind of oak, oak tree