plural of crystal ball

Synonym of crystal set

(colloquial) The drug methamphetamine hydrochloride.

(electronics) An early radio receiver, having no electrical power supply except the radio waves themselves; it used a crystal of lead or cadmium sulphide and a wire (the cat's whisker) touching the crystal's surface.

(chemistry, physics) A phase of matter similar to a liquid, in which the molecules are arranged regularly in one or two dimensions. / Material in that phase.

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

(crystallography) The intergrowth of two twin crystals.

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

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

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