equilateraladj.

/iːkwɪˈlatərəl/

Forms: Also 1500s–1600s equilaterall, (1600s æqui-).

Etymology: < late Latin aequilaterālis, < aequi- (see equi- comb. form) + latus , lateris side + -al suffix¹. Cf. earlier equilater adj.

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.

ΘΚΠ

the world > space > shape > symmetry or regularity > [adjective] > having equal sides

equilater1570

equilateral1592

society > leisure > the arts > visual arts > architecture > arch > [noun] > other types of arch

bowOE

craba1387

cove1511

triumphal arch (arc)a1566

straight arch1663

pointed arch1688

rough arch1693

jack-arch1700

oxi1700

raking arch1711

flat arch1715

scheme-arch1725

counter-arch1726

ox-eye arch1736

surbased dome1763

ogee1800

rising arch1809

sub-arch1811

deaf arch1815

four-centred arch1815

mixed arch1815

Tudor arch1815

camber1823

lancet arch1823

invert1827

platband1828

pier arch1835

ogive1841

scoinson arch1842

segment1845

skew arch1845

drop-arch1848

equilateral arch1848

lancet1848

rear arch1848

straining-arch1848

tierceron1851

shouldered arch1853

archlet1862

segment-arch1887

1592 R. Dallington tr. F. Colonna Hypnerotomachia f. 45^v Vnto which enclosure when wee came, I founde it equilaterall, with three fences like a streight wall.

1634 T. Herbert Relation Some Yeares Trauaile 112 The Sepulchre of Maleck Bahamans b[e]loued Queene..tis of foure Æquilaterall squares, eleuated eight yards high of stone.

1726 J. Swift Gulliver II. iii. ii. 20 A Shoulder of Mutton, cut into a Æquilateral Triangle.

1823 W. Scott St. Ronan's Well II. ii. 32 A cocked hat of equilateral dimensions.

1848 J. H. Parker Rickman's Styles Archit. Eng. (ed. 5) 88 The principal moulding of these doors has generally an equilateral arch.

1851 T. Wright & G. F. Richardson Introd. Geol. (new ed.) viii. 232 The shell is consequently equilateral.

1869 E. Dunkin Midnight Sky 21 Denebola Arcturus and Spica form very nearly an equilateral triangle.

1880 C. Taylor Anc. & Mod. Geom. Conics vi. 167 The Equilateral Hyperbola is..also called Rectangular.

1885 C. Leudesdorf tr. L. Cremona Elements Projective Geom. 269 If the hyperbola is equilateral..the asymptotes are the only pair of tangents which cut at right angles.

Derivatives

equiˈlaterally adv. in an equilateral manner or form.

ΘΚΠ

the world > space > shape > symmetry or regularity > [adverb] > having equal sides

equilaterally1852

1852 J. D. Dana U.S. Exploring Exped.: Crustacea Pt. II ii. 704 The posterior [epimeral] equilaterally triangular.

This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2022).

单词	equilateral
释义	equilateraladj. /iːkwɪˈlatərəl/ Forms: Also 1500s–1600s equilaterall, (1600s æqui-). Etymology: < late Latin aequilaterālis, < aequi- (see equi- comb. form) + latus , lateris side + -al suffix¹. Cf. earlier equilater adj. 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. ΘΚΠ the world > space > shape > symmetry or regularity > [adjective] > having equal sides equilater1570 equilateral1592 society > leisure > the arts > visual arts > architecture > arch > [noun] > other types of arch bowOE craba1387 cove1511 triumphal arch (arc)a1566 straight arch1663 pointed arch1688 rough arch1693 jack-arch1700 oxi1700 raking arch1711 flat arch1715 scheme-arch1725 counter-arch1726 ox-eye arch1736 surbased dome1763 ogee1800 rising arch1809 sub-arch1811 deaf arch1815 four-centred arch1815 mixed arch1815 Tudor arch1815 camber1823 lancet arch1823 invert1827 platband1828 pier arch1835 ogive1841 scoinson arch1842 segment1845 skew arch1845 drop-arch1848 equilateral arch1848 lancet1848 rear arch1848 straining-arch1848 tierceron1851 shouldered arch1853 archlet1862 segment-arch1887 1592 R. Dallington tr. F. Colonna Hypnerotomachia f. 45^v Vnto which enclosure when wee came, I founde it equilaterall, with three fences like a streight wall. 1634 T. Herbert Relation Some Yeares Trauaile 112 The Sepulchre of Maleck Bahamans b[e]loued Queene..tis of foure Æquilaterall squares, eleuated eight yards high of stone. 1726 J. Swift Gulliver II. iii. ii. 20 A Shoulder of Mutton, cut into a Æquilateral Triangle. 1823 W. Scott St. Ronan's Well II. ii. 32 A cocked hat of equilateral dimensions. 1848 J. H. Parker Rickman's Styles Archit. Eng. (ed. 5) 88 The principal moulding of these doors has generally an equilateral arch. 1851 T. Wright & G. F. Richardson Introd. Geol. (new ed.) viii. 232 The shell is consequently equilateral. 1869 E. Dunkin Midnight Sky 21 Denebola Arcturus and Spica form very nearly an equilateral triangle. 1880 C. Taylor Anc. & Mod. Geom. Conics vi. 167 The Equilateral Hyperbola is..also called Rectangular. 1885 C. Leudesdorf tr. L. Cremona Elements Projective Geom. 269 If the hyperbola is equilateral..the asymptotes are the only pair of tangents which cut at right angles. Derivatives equiˈlaterally adv. in an equilateral manner or form. ΘΚΠ the world > space > shape > symmetry or regularity > [adverb] > having equal sides equilaterally1852 1852 J. D. Dana U.S. Exploring Exped.: Crustacea Pt. II ii. 704 The posterior [epimeral] equilaterally triangular. This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2022). < adj.1592
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