pentahedronn.

Brit.

/ˌpɛntəˈhiːdr(ə)n/, U.S.

/ˌpɛn(t)əˈhidr(ə)n/

Inflections: Plural pentahedrons, pentahedra.

Forms: 1500s–1800s pentaedron, 1700s– pentahedron.

Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: penta- comb. form, -hedron comb. form.

Etymology: < penta- comb. form + -hedron comb. form, after post-classical Latin pentaedrum (1569 in the passage translated in quot. 1590).

A three-dimensional figure having five plane faces; a prism or other object having this form. Also: a pentagonal prism.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > penta-, hexa-, octa-, or dodecahedron

dodecahedron1570

octahedron1570

hexahedron1571

pentahedron1590

decahedron1828

1590 T. Hood tr. P. de La Ramée Elements Geom. xxiii. f. 21^v A prisme is a pentaedron [L. pentaedrum], or made of pentaedrons.

1611 A. Hopton Speculum Topographicum 198 A pentaedron..or a poliedron.

1712 H. Curzon Universal Libr. II. 154 A Prism is either a Pentahedron, Hexahedron, or a Polyhedron.

1775 J. Ash New Dict. Eng. Lang. Pentaedron, a pillar with five sides.

1854 Proc. Royal Soc. 7 482 Thus we shall at last reduce our x-hedron, either to a tetrahedron, or to a pentaedron having triedral summits.

1884 E. A. Abbott Flatland ii. xix. 85 The Sphere would willingly have continued his lessons by indoctrinating me in the conformation of all regular Solids, Cylinders, Cones, Pyramids, Pentahedrons, Hexahedrons, Dodecahedrons and Spheres.

1906 Amer. Jrnl. Math. 28 357 S, T, and U generate an ikosahedral group..which permutes evenly the five points and five flats of the pentahedron of reference P₀.

1995 Arch. Biochem. & Biophysics 305 29/1 Image processing has definitely shown that the end-on view is not a perfect cylinder but a regular pentahedron.

1996 School Arts Feb. 24 Their..box-like shapes vary from simple cubes or pyramids to more challenging pentahedrons and duo-decahedrons.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pentahedron
释义	pentahedronn. Brit. /ˌpɛntəˈhiːdr(ə)n/, U.S. /ˌpɛn(t)əˈhidr(ə)n/ Inflections: Plural pentahedrons, pentahedra. Forms: 1500s–1800s pentaedron, 1700s– pentahedron. Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: penta- comb. form, -hedron comb. form. Etymology: < penta- comb. form + -hedron comb. form, after post-classical Latin pentaedrum (1569 in the passage translated in quot. 1590). A three-dimensional figure having five plane faces; a prism or other object having this form. Also: a pentagonal prism. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > penta-, hexa-, octa-, or dodecahedron dodecahedron1570 octahedron1570 hexahedron1571 pentahedron1590 decahedron1828 1590 T. Hood tr. P. de La Ramée Elements Geom. xxiii. f. 21^v A prisme is a pentaedron [L. pentaedrum], or made of pentaedrons. 1611 A. Hopton Speculum Topographicum 198 A pentaedron..or a poliedron. 1712 H. Curzon Universal Libr. II. 154 A Prism is either a Pentahedron, Hexahedron, or a Polyhedron. 1775 J. Ash New Dict. Eng. Lang. Pentaedron, a pillar with five sides. 1854 Proc. Royal Soc. 7 482 Thus we shall at last reduce our x-hedron, either to a tetrahedron, or to a pentaedron having triedral summits. 1884 E. A. Abbott Flatland ii. xix. 85 The Sphere would willingly have continued his lessons by indoctrinating me in the conformation of all regular Solids, Cylinders, Cones, Pyramids, Pentahedrons, Hexahedrons, Dodecahedrons and Spheres. 1906 Amer. Jrnl. Math. 28 357 S, T, and U generate an ikosahedral group..which permutes evenly the five points and five flats of the pentahedron of reference P₀. 1995 Arch. Biochem. & Biophysics 305 29/1 Image processing has definitely shown that the end-on view is not a perfect cylinder but a regular pentahedron. 1996 School Arts Feb. 24 Their..box-like shapes vary from simple cubes or pyramids to more challenging pentahedrons and duo-decahedrons. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1590
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