One of the mysteries of the English language finally explained.
A small tree native to swampy parts of the south-eastern United States, Planera aquatica (family Ulmaceae), resembling a small elm but having single-toothed leaves and wingless, warty fruits.
Early 19th century. From the name of Johann Jakob Planer, German botanist + tree.
planer tree/ˈpleɪnə triː/
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