
Definition of Trigonal
1. Adjective. Having threefold symmetry.
Category relationships: Crystallography
Similar to: Symmetric, Symmetrical
Derivative terms: Rhombohedron
Definition of Trigonal
1. a. Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.
Definition of Trigonal
1. Adjective. symmetrically triangular ¹
¹ Source: wiktionary.com
Definition of Trigonal
1. shaped like a triangle [adj]
Medical Definition of Trigonal
1.
Trigonal Pictures
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Lexicographical Neighbors of Trigonal
Literary usage of Trigonal
Below you will find example usage of this term as found in modern and/or classical literature:
1. A Textbook of Mineralogy: With an Extended Treatise on Crystallography and by Edward Salisbury Dana (1922)
"This class has, besides the vertical axis of trigonal symmetry, ... trigonal prism
consisting of three faces comprising one half the faces of the hexagonal ..."
2. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"It has six equal edges with faces meeting at 70 32', and four trigonal angles.
The principal axes join the middle points of each two opposite edge«. ..."
3. A Textbook of Mineralogy: With an Extended Treatise on Crystallography and by Edward Salisbury Dana (1898)
"It has, besides the vertical axis of trigonal symmetry, three horizontal axes of
binary ... The characteristic forms are the trigonal prism and pyramid and ..."
4. Guide to the Mineral Collections in the Illinois State Museum by Illinois State Museum, Alja Robinson Crook (1920)
"But their trigonal character can be discovered by heating them and plunging them
into ... form of the diagonal pyramid called the "right trigonal pyramid. ..."
5. A Treatise on Crystallography by William James Lewis (1899)
"No crystal has yet been discovered showing the symmetry of the trigonal ...
The general form is a trigonal bipyramid similar geometrically to those ..."