noun
crystal
KRIHS-tuhl
noun
1
A solid substance whose atoms are arranged in a regular, repeating pattern, often forming clear geometric shapes.
"Snowflakes are made of tiny ice crystals."
2
A clear, glass-like mineral, or fine glassware made to resemble it.
"The chandelier was made of hand-cut crystal."
adjective
1
Extremely clear.
"The water in the lagoon was crystal clear."
How to Use Crystal
Learner’s notesIn plain EnglishA clear, often geometrically shaped mineral or glass, or an adjective meaning very clear.
Common pairings
crystal clear
crystal glass
crystal ball
Word Forms
crystals plural
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Etymology
From Greek krystallos ("clear ice"), reflecting how ancient people once believed quartz crystal was permanently frozen ice.