(crystallography) The intergrowth of two twin crystals.

(crystallography) either of two separate crystals that share crystal lattice points in a symmetrical manner and intergrow

a clock which is regulated by a quartz crystal

a class of crystal consisting of a lattice of ions held together by their electrostatic interaction; they exhibit strong absorption of infrared radiation and have planes along which they cleave easily

A material formed from by the growth of a crystal nucleus without secondary nucleation or impingement on other crystals; a regular three-dimensional structure extends throughout the material

(crystallography) A regular three-dimensional geometric arrangement of atoms, molecules or ions in a crystal

(medicine) The use of a probe containing liquid nitrogen to freeze and thus destroy tissue.

(idiomatic) Completely clear and understood. / (idiomatic) Visually clear, a sharp image, high acuity.

A dye, derived from gentian violet, that is used as an acid-base indicator and as a biological stain.

A globe of glass or crystal used to foretell the future. / (by extension) A way of seeing into the future. / One of the magickal tools of Wicca, used for divination and altar purposes