Parabolæ

Noun

1. parabolæ

   (irregular plural of parabola)
• 1905, Edward Wegmann, The Design and Construction of Dams, John Wiley & Sons; fourth edition, Chapter IX, page #68:The two parabolæ which bound the profile have the same axis, which is horizontal and at the level of the top of the dam. The vertices of the parabolæ are respectively at the front and back edge of the top of the profile.