trihedraladj.n.

Brit.

/trʌɪˈhiːdrəl/,

/trʌɪˈhɛdrəl/, U.S.

/traɪˈhidrəl/

Forms: Also triedral.

Etymology: < Greek τρι tri- comb. form + ἕδρα base + -al suffix¹.

Geometry, Crystallography, Natural History, etc.

A. adj. Of a solid figure or body: Having three sides or faces (in addition to the base or ends); bounded laterally by three surfaces; triangular in section.

trihedral angle or trihedral quoin, a solid angle formed by three surfaces meeting at a point.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [adjective] > triangular > pyramidal or triangular in section

pyramidalc1450

trigonal1571

pyramidate1572

pyramidical1599

pyramidy1627

pyramical1633

triangular1644

pyramidated1745

triquetrous1752

trihedral angle1789

pyramoidal1883

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

trihedral angle1789

the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > with particular section or base > triangular

trigonal1571

trihedral angle1789

triquadrantal1896

1789 A. Crawford in Med. Communications 2 355 Obtuse trihedral pyramids.

1812 H. Davy Elements Chem. Philos. 125 Thus 6 particles may compose an octoedron or triedral prism.

1841 Todd's Cycl. Anat. & Physiol. III. 267/2 The inferior molars are..divided into two triedral portions.

1878 H. P. Gurney Crystallogr. 85 The trihedral quoins of the rhombic dodecahedron.

1880 T. H. Huxley Crayfish iii. 116 Each of these joints is trihedral, the outer face being convex; the inner, flat; and the upper concave.

B. n. Geometry.

Thesaurus »

Categories »

A trihedral figure; the figure determined by three planes meeting at a point ( Cent. Dict. Suppl. 1909).

Derivatives

triˈhedron n. = B.

ΘΚΠ

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

tetrahedron1570

trihedron1828

trihedral1889

1828 N. Webster Amer. Dict. Eng. Lang. Trihedron, a figure having three equal sides.

1860 J. E. Worcester Dict. Eng. Lang. (citing Davies).

This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2022).

单词	trihedral
释义	trihedraladj.n. Brit. /trʌɪˈhiːdrəl/, /trʌɪˈhɛdrəl/, U.S. /traɪˈhidrəl/ Forms: Also triedral. Etymology: < Greek τρι tri- comb. form + ἕδρα base + -al suffix¹. Geometry, Crystallography, Natural History, etc. A. adj. Of a solid figure or body: Having three sides or faces (in addition to the base or ends); bounded laterally by three surfaces; triangular in section. trihedral angle or trihedral quoin, a solid angle formed by three surfaces meeting at a point. ΘΚΠ the world > space > shape > angularity > specific angular shape > [adjective] > triangular > pyramidal or triangular in section pyramidalc1450 trigonal1571 pyramidate1572 pyramidical1599 pyramidy1627 pyramical1633 triangular1644 pyramidated1745 triquetrous1752 trihedral angle1789 pyramoidal1883 the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having number of faces > trihedral trihedral angle1789 the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > with particular section or base > triangular trigonal1571 trihedral angle1789 triquadrantal1896 1789 A. Crawford in Med. Communications 2 355 Obtuse trihedral pyramids. 1812 H. Davy Elements Chem. Philos. 125 Thus 6 particles may compose an octoedron or triedral prism. 1841 Todd's Cycl. Anat. & Physiol. III. 267/2 The inferior molars are..divided into two triedral portions. 1878 H. P. Gurney Crystallogr. 85 The trihedral quoins of the rhombic dodecahedron. 1880 T. H. Huxley Crayfish iii. 116 Each of these joints is trihedral, the outer face being convex; the inner, flat; and the upper concave. B. n. Geometry. Thesaurus » Categories » A trihedral figure; the figure determined by three planes meeting at a point ( Cent. Dict. Suppl. 1909). Derivatives triˈhedron n. = B. ΘΚΠ the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > pyramid > specific tetrahedron1570 trihedron1828 trihedral1889 1828 N. Webster Amer. Dict. Eng. Lang. Trihedron, a figure having three equal sides. 1860 J. E. Worcester Dict. Eng. Lang. (citing Davies). This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2022). < adj.n.1789
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