trapezoidaladj.

/trapɪˈzɔɪdəl/

Etymology: < trapezoid n. + -al suffix¹: compare French trapézoïdal (Littré).

a. Having the form of a trapezoid; irregularly quadrilateral. Sometimes used for trapeziform adj.; this sense is standard in the U.S.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [adjective] > quadrilateral > trapezial

trapezial1681

trapeziform1776

trapezoidal1794

trapezoid1819

trapezate1826

the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > quadrilateral > trapezial

trapezial1681

trapeziform1776

trapezoidal1794

trapezoid1819

1794 R. Kirwan Elements Mineral. (ed. 2) I. 259 Oriental Garnet..presenting either 12 rhomboidal planes, or 24 trapezoidal.

1831 R. Knox tr. H. Cloquet Syst. Human Anat. (ed. 2) 401 Each of these muscles occupies the side of the larynx; it is thin, flat, and of a trapezoidal figure.

1873 M. Collins Squire Silchester v An irregular trapezoidal space, where..cattle and sheep are penned.

1955 Sci. Amer. Mar. 101/2 The temple has a trapezoidal central pyramid.

1973 Nature 21 Sept. 160/1 Trace brightness was modulated by a periodic trapezoidal wave~form.

b. Having trapezoidal faces; trapezohedral.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape

trapezoidal1794

trapezoidiform1826

rhombohedric1830

pentagonal1837

trapezohedral1849

trigonal1878

1794 R. Kirwan Elements Mineral. (ed. 2) I. 36 When a fossil is broken into fragments, the shape of these is..sometimes cubical, rhomboidal, or pyramidal, or trapezoidal.

1816 R. Jameson Treat. External Characters Minerals (ed. 2) 196 A Crystal is..Trapezoidal..when its surface consists of twenty-four equal and similar trapeziums [i.e. trapezoids]... Example, Trapezoidal garnet.

1822 J. Parkinson Outl. Oryctol. 8 Its [coal's] fragments mostly cubical or trapezoidal.

Derivatives

trapeˈzoidiform adj.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape

trapezoidal1794

trapezoidiform1826

rhombohedric1830

pentagonal1837

trapezohedral1849

trigonal1878

1826 W. Kirby & W. Spence Introd. Entomol. IV. xlvi. 266 Trapezoidiform... Whose horizontal section is trapezoid.

This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2020).

单词	trapezoidal
释义	trapezoidaladj. /trapɪˈzɔɪdəl/ Etymology: < trapezoid n. + -al suffix¹: compare French trapézoïdal (Littré). a. Having the form of a trapezoid; irregularly quadrilateral. Sometimes used for trapeziform adj.; this sense is standard in the U.S. ΘΚΠ the world > space > shape > angularity > specific angular shape > [adjective] > quadrilateral > trapezial trapezial1681 trapeziform1776 trapezoidal1794 trapezoid1819 trapezate1826 the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > quadrilateral > trapezial trapezial1681 trapeziform1776 trapezoidal1794 trapezoid1819 1794 R. Kirwan Elements Mineral. (ed. 2) I. 259 Oriental Garnet..presenting either 12 rhomboidal planes, or 24 trapezoidal. 1831 R. Knox tr. H. Cloquet Syst. Human Anat. (ed. 2) 401 Each of these muscles occupies the side of the larynx; it is thin, flat, and of a trapezoidal figure. 1873 M. Collins Squire Silchester v An irregular trapezoidal space, where..cattle and sheep are penned. 1955 Sci. Amer. Mar. 101/2 The temple has a trapezoidal central pyramid. 1973 Nature 21 Sept. 160/1 Trace brightness was modulated by a periodic trapezoidal wave~form. b. Having trapezoidal faces; trapezohedral. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape trapezoidal1794 trapezoidiform1826 rhombohedric1830 pentagonal1837 trapezohedral1849 trigonal1878 1794 R. Kirwan Elements Mineral. (ed. 2) I. 36 When a fossil is broken into fragments, the shape of these is..sometimes cubical, rhomboidal, or pyramidal, or trapezoidal. 1816 R. Jameson Treat. External Characters Minerals (ed. 2) 196 A Crystal is..Trapezoidal..when its surface consists of twenty-four equal and similar trapeziums [i.e. trapezoids]... Example, Trapezoidal garnet. 1822 J. Parkinson Outl. Oryctol. 8 Its [coal's] fragments mostly cubical or trapezoidal. Derivatives trapeˈzoidiform adj. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape trapezoidal1794 trapezoidiform1826 rhombohedric1830 pentagonal1837 trapezohedral1849 trigonal1878 1826 W. Kirby & W. Spence Introd. Entomol. IV. xlvi. 266 Trapezoidiform... Whose horizontal section is trapezoid. This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2020). < adj.1794
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