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equilateral, a.|iːkwɪˈlætərəl|
Also 6–7 equilaterall, (7 æqui-).
[ad. late L. æquilaterālis, f. æqui- (see equi-) + latus, later-is side + -al1.]
Having all the sides equal.
equilateral arch: an arch, in which the chords of the sides form with the base an equilateral triangle. equilateral hyperbola, one whose axes are equal. equilateral shell, one in which a transverse line drawn through the apex of the umbo divides the valve into two equal and symmetrical parts.
1570Billingsley Euclid i. i. 10 How to describe an equilaterall triangle redily and mechanically. 1634Sir T. Herbert Trav. 112 The Sepulchre of Maleck Bahamans beloued Queene..'tis of foure æquilaterall squares, eleuated eight yards high of stone. 1727Swift Gulliver iii. ii. 185 A shoulder of mutton, cut into an equilateral triangle. 1824Scott St. Ronan's xv, A cocked hat of equilateral dimensions. 1848Rickman Archit. 88 The principal moulding of these doors has generally an equilateral arch. 1851Richardson Geol. viii. 232 The shell is consequently equilateral. 1869Dunkin Midn. Sky 21 Denebola, Arcturus and Spica form very nearly an equilateral triangle. 1880C. Taylor Anc. & Mod. Geom. Conics vi. 167 The Equilateral Hyperbola is..also called Rectangular. 1885C. Leudesdorf Cremona's Proj. Geom. 269 If the hyperbola is equilateral..the asymptotes are the only pair of tangents which cut at right angles.
Hence equiˈlaterally adv., in an equilateral manner or form.
1852Dana Crust. ii. 704 The posterior [epimeral] equilaterally triangular. |