a clear, transparent mineral or glass resembling ice.
2.
the transparent form of crystallized quartz.
3.
Chemistry,Mineralogy. a solid body having a characteristic internal structure and enclosed by symmetrically arranged plane surfaces, intersecting at definite and characteristic angles.
4.
anything made of or resembling such a substance.
5.
a single grain or mass of a crystalline substance.
Electronics. a quartz crystal ground in the shape of a rectangular parallelepiped, which vibrates strongly at one frequency when electric voltages of that frequency are placed across opposite sides: used to control the frequency of an oscillator (crystal oscillator), as of a radio transmitter.
11.
Slang. any stimulant drug in powder form, as methamphetamine or PCP.
to cover or coat with, or as if with, crystal (usually followed by over).
Origin: before 1000; Middle English cristal(le), Old English cristalla < Medieval Latin cristallum,Latin crystallum < Greek krýstallos clear ice, rock crystal, derivative of krystaínein to freeze; see cryo-