Definition of crystal
i. A regular polyhedral form, bounded by planes, which is assumed by a chemical element or compound, under the action of its intermolecular forces, which passing, under suitable conditions, from the state of a liquid or gas to that of a solid. A crystal is characterized first by its definite internal molecular structure and second, by its external form.
Ref: Fay
ii. The regular polyhedral form, bounded by plane surfaces, which is the outward expression of a periodic or regularly repeating internal arrangement of atoms.
See Also: crystal face
iii. A body formed by the solidification under favorable conditions of a chemical element, a compound, or an isomorphous mixture and having a regularly repeating internal arrangement of its atoms; esp. such a body that has natural external plane faces as a result of the internal structure.
Ref: Webster 3rd
iv. Quartz that is transparent or nearly so and that is either colorless or only slightly tinged. Also a piece of this material. Also called rock crystal.
Ref: Webster 3rd
v. A colorless transparent diamond.
Ref: Webster 3rd
vi. As an adj., consisting of or resembling crystal. Syn. for crystalline; clear; transparent. Relating to or using a crystal.
Ref: Webster 3rd
vii. A regular polyhedron exhibited by a chemical element or compound where its atomic particles assume a periodic array under suitable physical and chemical conditions. The external form is a low-energy response to the symmetry of the internal forces with each face parallel to a high-density plane of atomic particles.
viii. Any solid material with a periodic internal structure.
Synonym of: crystalline
ix. Glass of superior quality and high density and luster (resulting from inclusion of lead salts in old objects), commonly with ornamental cutting, e.g., flint glass.
x. An adj. referring to material properties, e.g., crystal structure (for internal periodicity), crystal solution (as between end members of a mineral series).
xi.
Direct-space definition
"A solid is a crystal if its atoms, ions and/or molecules form, on average, a long-range ordered arrangement"
Reciprocal-space definition
"A material is a crystal if it has essentially a sharp diffraction pattern."
https://dictionary.iucr.org/Crystal
Ref: Fay
ii. The regular polyhedral form, bounded by plane surfaces, which is the outward expression of a periodic or regularly repeating internal arrangement of atoms.
See Also: crystal face
iii. A body formed by the solidification under favorable conditions of a chemical element, a compound, or an isomorphous mixture and having a regularly repeating internal arrangement of its atoms; esp. such a body that has natural external plane faces as a result of the internal structure.
Ref: Webster 3rd
iv. Quartz that is transparent or nearly so and that is either colorless or only slightly tinged. Also a piece of this material. Also called rock crystal.
Ref: Webster 3rd
v. A colorless transparent diamond.
Ref: Webster 3rd
vi. As an adj., consisting of or resembling crystal. Syn. for crystalline; clear; transparent. Relating to or using a crystal.
Ref: Webster 3rd
vii. A regular polyhedron exhibited by a chemical element or compound where its atomic particles assume a periodic array under suitable physical and chemical conditions. The external form is a low-energy response to the symmetry of the internal forces with each face parallel to a high-density plane of atomic particles.
viii. Any solid material with a periodic internal structure.
Synonym of: crystalline
ix. Glass of superior quality and high density and luster (resulting from inclusion of lead salts in old objects), commonly with ornamental cutting, e.g., flint glass.
x. An adj. referring to material properties, e.g., crystal structure (for internal periodicity), crystal solution (as between end members of a mineral series).
xi.
Direct-space definition
"A solid is a crystal if its atoms, ions and/or molecules form, on average, a long-range ordered arrangement"
Reciprocal-space definition
"A material is a crystal if it has essentially a sharp diffraction pattern."
https://dictionary.iucr.org/Crystal
