noun

1. A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.

2. A piece of glimmering, shining mineral resembling ice or glass.

3. A fine type of glassware, or the material used to make it.

Synonyms: grain

adjective

1. Very clear.

   “"Do I make myself clear?" / "Crystal."”