Definition of post oak in US English:

post oak

noun

  • Any of several kinds of North American oak having hard close-grained durable wood much used for posts, sleepers, etc., especially: (a) Quercus stellata, found in sandy soils of the central and eastern United States (also called iron-oak); (b) (in full "swamp post oak") Q. lyrata, of river swamps in the southern United States (also called overcup oak).

Origin

Late 18th century; earliest use found in Bernard Romans (c1720–?1784), cartographer and revolutionary army officer in America. From post + oak.

Pronunciation

post oak

/ˈpəʊst əʊk/