Definition of Trigonal

1. Adjective. Having threefold symmetry.

Exact synonyms: Rhombohedral
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. Triangular in cross-section as applied to stems. (09 Oct 1997)

Trigonal Pictures

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Lexicographical Neighbors of Trigonal

triglyceridaemia
triglyceride
triglyceridemia
triglycerides
triglyph
triglyphic
triglyphical
triglyphs
trigness
trignesses
trigo
trigold
trigon
trigona
trigona fibrosa cordis
trigonal (current term)
trigonally
trigone
trigone of auditory nerve
trigone of bladder
trigone of fillet
trigone of habenula
trigone of hypoglossal nerve
trigone of lateral ventricle
trigone of vagus nerve
trigonelline
trigones
trigonia
trigonic
trigonid

Literary usage of Trigonal

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Text-book 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 Text-book 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 ..."

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