trigonal system, one of the structural categories to which crystalline solids can be assigned. The trigonal system is sometimes considered to be a subdivision of the hexagonal system.

The meaning of TRIGONAL is of, relating to, or being the division of the hexagonal crystal system or the forms belonging to it characterized by a vertical axis of threefold symmetry.

In crystallography, the hexagonal crystal family is one of the six crystal families, which includes two crystal systems (hexagonal and trigonal) and two lattice systems (hexagonal and …

The trigonal crystal system, also known as the rhombohedral system, is one of the seven fundamental crystal systems used to classify crystalline solids. It is defined by the presence of …

TRIGONAL definition: of, relating to, or shaped like a triangle; having three angles; triangular. See examples of trigonal used in a sentence.

Aug 19, 2025 · trigonal (comparative more trigonal, superlative most trigonal) Having three angles and three sides, triangular. (crystallography) Of or pertaining to a crystal system with three …

There are eight meanings listed in OED's entry for the word trigonal, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Definition of 'trigonal' trigonal in British English (ˈtrɪɡənəl ) adjective 1. another word for triangular (sense 1)

Three groups of electrons around an atom X, always give a trigonal planar arrangement around the central atom X-. X-ray diffraction studies show it has the expected trigonal bipyramidal …

It only has one minor difference from the hexagonal system, in that trigonal minerals have threefold symmetry, whereas true hexagonal minerals have sixfold symmetry. The trigonal …