Lewis & Short

quā̆drātūra, ae, f. [quadro].

  1. I. A making square, squaring, quadrature (postclass.): circuli quadratura, the squaring or quadrature of the circle, App. Dogm. Plat. 3, p. 37, 11.
  2. II. Transf., a square: vitreae, Vop. Firm. 3.