plural of ionic crystal

plural of Charcot-Leyden crystal

plural of thorn-apple crystal

plural of space-time crystal

(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.

plural of crystal ball

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

(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.

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

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