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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Encyclopedia Britannica

Encyclopedia

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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00:10

Pin oak is always a great word to know.

So is ninnyhammer. Does it mean: