post oak

noun
any of several American oaks, especially Quercus stellata, the wood of which is used for posts.

Origin:
1755–65, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
post oak

noun
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 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Post oak is drought-tolerant and is often used in urban landscaping and to stabilize poor, erodible soils.
Control use of the degraded portions of the post oak-blackjack oak barrens.
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