pin oak

noun
an oak, Quercus palustris, characterized by the pyramidal manner of growth of its branches and deeply pinnatifid leaves.

Origin:
1805–15, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
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pin oak

either of two species of North American ornamental and timber trees belonging to the red oak group of the genus Quercus in the beech family (Fagaceae). The term is especially given to Quercus palustris, found on bottomlands and moist upland soils in the eastern and central United States. Usually about 25 m (80 feet) tall but occasionally reaching 35 m (115 feet), the tree has a broad, pyramidal crown and drooping lower branches. Spurlike, slender branchlets stand out like pins on the trunk and larger limbs. The elliptical, glossy green leaves, measuring about 13 cm (5 inches) long, have five to seven deeply cut lobes and turn scarlet in autumn. The dark brown acorns are enclosed at the base in a thin, shallow cup

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Northern pin oak is distinguished from pin oak by its more tapering and
  elongated acorns and its preference for drier habitats.
Trees in the red oak group, such as northern red and northern pin oak are
  especially vulnerable.
The conical shape and stiffly arranged horizontal side branches of pin oak make
  it easy to spot.
The driest jack pine-northern pin oak barrens did not change significantly
  after logging.
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