tetrahedronn.

Brit.

/tɛtrəˈhiːdrən/,

/tɛtrəˈhɛdrən/, U.S.

/ˌtɛtrəˈhidrən/

Forms: Plural tetrahedra or tetrahedrons. Also 1500s–1800s tetraedron; 1500s–1700s tetra(h)edrum.

Etymology: < late Greek τετράεδρον, neuter of τετράεδρος four-sided, < τετρα- four + ἕδρα base.

Geometry.

A solid figure contained by four plane triangular faces, a triangular pyramid; spec. the regular tetrahedron, the first of the five regular solids, contained by four equilateral triangles. Hence, any solid body, esp. a crystal, of this form. orthogonal tetrahedron, one in which the opposite edges, taken in pairs, are at right angles to one another. polar tetrahedron, one of which the faces are polar to the vertices of another tetrahedron.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > cone > pyramid

pyramid1570

tetrahedron1570

pyramidate1611

parabolic pyramidoid1704

pyramidoid1704

pyramoid1819

the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > pyramid > specific

tetrahedron1570

trihedron1828

trihedral1889

1570 H. Billingsley tr. Euclid Elements Geom. xi. f. 318^v A Tetrahedron is a solide which is contained vnder fower triangles equall and equilater.

1571 T. Digges in L. Digges's Geom. Pract.: Pantometria Defs. sig. T ij Tetraedron..a body Geometricall.

1571 T. Digges in L. Digges's Geom. Pract.: Pantometria Defs. sig. T ij. (margin) Tetraedrum.

1653 H. More Antidote against Atheisme i. vii. §5 The notion or idea of God..is no more arbitrarious or fictitious than the notion of a cube or tetraedrum or any other of the regular bodies in Geometry.

1706 W. Jones Synopsis Palmariorum Matheseos 234 The Tetraedrum of 4 solid ∠s.

1800 tr. E. J. B. Bouillon-Lagrange Man. Course Chem. I. 359 Susceptible of crystallizing in tetraedra.

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 50 They [crystalloids] appear as cubes, tetrahedra, octohedra, rhombohedra, and in other forms.

1878 H. P. Gurney Crystallogr. 92 Tetrahedrons are contained by four equiangular triangles.

This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).

单词	tetrahedron
释义	tetrahedronn. Brit. /tɛtrəˈhiːdrən/, /tɛtrəˈhɛdrən/, U.S. /ˌtɛtrəˈhidrən/ Forms: Plural tetrahedra or tetrahedrons. Also 1500s–1800s tetraedron; 1500s–1700s tetra(h)edrum. Etymology: < late Greek τετράεδρον, neuter of τετράεδρος four-sided, < τετρα- four + ἕδρα base. Geometry. A solid figure contained by four plane triangular faces, a triangular pyramid; spec. the regular tetrahedron, the first of the five regular solids, contained by four equilateral triangles. Hence, any solid body, esp. a crystal, of this form. orthogonal tetrahedron, one in which the opposite edges, taken in pairs, are at right angles to one another. polar tetrahedron, one of which the faces are polar to the vertices of another tetrahedron. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > cone > pyramid pyramid1570 tetrahedron1570 pyramidate1611 parabolic pyramidoid1704 pyramidoid1704 pyramoid1819 the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > pyramid > specific tetrahedron1570 trihedron1828 trihedral1889 1570 H. Billingsley tr. Euclid Elements Geom. xi. f. 318^v A Tetrahedron is a solide which is contained vnder fower triangles equall and equilater. 1571 T. Digges in L. Digges's Geom. Pract.: Pantometria Defs. sig. T ij Tetraedron..a body Geometricall. 1571 T. Digges in L. Digges's Geom. Pract.: Pantometria Defs. sig. T ij. (margin) Tetraedrum. 1653 H. More Antidote against Atheisme i. vii. §5 The notion or idea of God..is no more arbitrarious or fictitious than the notion of a cube or tetraedrum or any other of the regular bodies in Geometry. 1706 W. Jones Synopsis Palmariorum Matheseos 234 The Tetraedrum of 4 solid ∠s. 1800 tr. E. J. B. Bouillon-Lagrange Man. Course Chem. I. 359 Susceptible of crystallizing in tetraedra. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 50 They [crystalloids] appear as cubes, tetrahedra, octohedra, rhombohedra, and in other forms. 1878 H. P. Gurney Crystallogr. 92 Tetrahedrons are contained by four equiangular triangles. This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022). < n.1570
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