crystal
//ˈkrɪstəl//
Noun
A solid material whose atoms or molecules are arranged in a highly ordered, repeating three-dimensional pattern, typically having flat surfaces and symmetrical angles.
Salt forms cubic crystals when it dries.
A piece of a transparent mineral, especially quartz, used in jewelry or decoration.
She wore a necklace with a beautiful crystal pendant.
High-quality clear, colorless glass, especially with a high lead content, used for making fine glassware.
The wine glasses are made of fine crystal.
The transparent protective cover over a watch face.
The crystal on my watch is scratched and needs to be replaced.
Adjective
Made of or resembling crystal; clear and transparent.
The lake water was crystal clear.
Completely clear or transparent in meaning; easily understood.
She made her intentions crystal clear from the start.