a. and sb. Obs. Also 6 equilatre, 7 æquilater. [ad. Fr. equilatere, ad. late L. æquilater-us, f. æqui- (see EQUI-) + latus, later-is side.]
A. adj. Having equal sides.
1570. Billingsley, Euclid, I. def. 24. An equilatre triangle is that, which hath three equall sides.
1589. Puttenham, Eng. Poesie, II. xi. (Arb.), 113. Of the square or quadrangle equilater.
1621. Burton, Anat. Mel., III. i. III. i. 520. Faith and Hope, which with this our loue make … an Æquilater Triangle.
1661. S. Partridge, Double Scale Proport., 50. To find the side of an Equilater triangle.
1715. De Moivre, in Phil. Trans., XXIX. 335. Let A H h be an Equilater Hyperbola.
B. sb. a. Geom. A square or cube. b. Arith. A square or cube number.
1614. T. Bedwell, Nat. Geom. Numbers, i. 4. 4 is a figurate equilater, and the side or roote of it is 2.
1636. Hartwell, in Recorde, Gr. Artes, 560. An æquilater plaine is a number made by two equall sides, or by any number multiplyed by it selfe. It is vulgarly called a square or quadrat. Ibid., 570. An Equilater, is a number made by three equall sides, or by any number multiplyed by it selfe, and that product againe by the foresaid number. It is called an Equilater … or Cube.
