Bedeutung von “crystal” — Learner’s Dictionary

crystal

noun us uk /ˈkrɪstəl/
ROCK [ C, U ]
GLASS [ U ]

a type of high quality glass:

a crystal vase
SHAPE [ C ]

a piece of a substance that has become solid, with a regular shape:

ice crystals

(Definition von “crystal” aus dem Cambridge Learner's Dictionary © Cambridge University Press)