pentahedraladj.

Brit.

/ˌpɛntəˈhiːdr(ə)l/, U.S.

/ˌpɛn(t)əˈhidr(ə)l/

Forms: 1700s–1800s pentaedral, 1700s– pentahedral.

Origin: Formed within English, by compounding. Etymons: penta- comb. form, -hedral comb. form.

Etymology: < penta- comb. form + -hedral comb. form, after pentahedron n. Compare French pentaèdre , adjective (1761 or earlier). Compare earlier pentahedrical adj., pentahedrous adj.

Having the form of a pentahedron; (esp. of a solid figure or object) having five faces, as a prism of pentagonal cross-section.

ΘΚΠ

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

pentahedrical1658

pentahedrousa1728

pentahedral1758

1758 W. Borlase Nat. Hist. Cornwall xii. 140 The surface is divided into twenty triangular planes, five of which make a pentahedral cuspis at one end, and five make the like cuspis at the opposite extremity.

1798 tr. R. P. Lamanon & Mongès Jrnl. 24 Aug. 1785 in tr. J. F. G. de la Pérouse Voy. round World III. 159 Terminated at one end by a pentaedral summit [Fr. un sommet pentaèdre].

1804 Philos. Trans. (Royal Soc.) 94 310 (note) Hexaedral and pentaedral prisms are most abundant; then the tetraedral, the triedral, heptaedral, and octaedral.

1898 Geogr. Jrnl. 12 458 As they are pentahedral in shape they always lie well on the bottom, no matter on which of their principal surfaces they fall.

1935 Amer. Jrnl. Bot. 22 3 The elongated cortical parenchyma cells in the stems and roots studied had concave-sided, often pentahedral, tube-shaped intercellular spaces.

1998 Science 28 Aug. 1267 A local arrangement called a pentahedral prism, consisting of 12 spheres surrounding a 13th central sphere, became the subject of Ferguson's doctoral dissertation.

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

单词	pentahedral
释义	pentahedraladj. Brit. /ˌpɛntəˈhiːdr(ə)l/, U.S. /ˌpɛn(t)əˈhidr(ə)l/ Forms: 1700s–1800s pentaedral, 1700s– pentahedral. Origin: Formed within English, by compounding. Etymons: penta- comb. form, -hedral comb. form. Etymology: < penta- comb. form + -hedral comb. form, after pentahedron n. Compare French pentaèdre , adjective (1761 or earlier). Compare earlier pentahedrical adj., pentahedrous adj. Having the form of a pentahedron; (esp. of a solid figure or object) having five faces, as a prism of pentagonal cross-section. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having number of faces > pentahedral pentahedrical1658 pentahedrousa1728 pentahedral1758 1758 W. Borlase Nat. Hist. Cornwall xii. 140 The surface is divided into twenty triangular planes, five of which make a pentahedral cuspis at one end, and five make the like cuspis at the opposite extremity. 1798 tr. R. P. Lamanon & Mongès Jrnl. 24 Aug. 1785 in tr. J. F. G. de la Pérouse Voy. round World III. 159 Terminated at one end by a pentaedral summit [Fr. un sommet pentaèdre]. 1804 Philos. Trans. (Royal Soc.) 94 310 (note) Hexaedral and pentaedral prisms are most abundant; then the tetraedral, the triedral, heptaedral, and octaedral. 1898 Geogr. Jrnl. 12 458 As they are pentahedral in shape they always lie well on the bottom, no matter on which of their principal surfaces they fall. 1935 Amer. Jrnl. Bot. 22 3 The elongated cortical parenchyma cells in the stems and roots studied had concave-sided, often pentahedral, tube-shaped intercellular spaces. 1998 Science 28 Aug. 1267 A local arrangement called a pentahedral prism, consisting of 12 spheres surrounding a 13th central sphere, became the subject of Ferguson's doctoral dissertation. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < adj.1758
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