(Geom.) A curve of the third order, consisting of two infinite branches, which have a common asymptote. The curve has a double point, and a leaf-shaped loop; whence the name. Its equation is x^(3) + y^(3) = axy.
... carmen prope primum 'Folium ultimum' nominatum est, folia adhuc plura e scriniis suis esse prolaturum. Novimus quanta lepore descripserit colloquia illa antemeridiana, symposia illa sobria et severa, sed eadem festiva et faceta, in quibus totiens mutata persona, modo poeta, modo professor, modo princeps ... — The Autocrat of the Breakfast-Table • Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)
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