Definitions
There are 2 meanings of the phrase
Jack Oak.
Jack Oak - as a noun
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
Synonyms (Exact Relations)
blackjackblackjack oakquercus marilandicaSmall to medium deciduous oak of east central north america; leaves have sharply pointed lobes
Synonyms (Exact Relations)
northern pin oakquercus ellipsoidalis