crystal (crystals plural )
1 n-count A crystal is a small piece of a substance that has formed naturally into a regular symmetrical shape.
oft n N
...salt crystals., ...a single crystal of silicon.
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liquid crystal
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liquid crystal display
2 n-var Crystal is a transparent rock that is used to make jewellery and ornaments.
...a strand of crystal beads.
3 n-uncount Crystal is a high quality glass, usually with patterns cut into its surface.
Some of the finest drinking glasses are made from lead crystal., ...crystal glasses.
4 n-uncount Glasses and other containers made of crystal are referred to as crystal. Get out your best china and crystal.
crystal ball (crystal balls plural )If you say that someone, especially an expert, looks into a crystal ball, you mean that they are trying to predict the future. Crystal balls are traditionally used by fortune-tellers. n-count
Local economists have looked into their crystal balls and seen something rather nasty...
crystal clear
1 adj Water that is crystal clear is absolutely clear and transparent like glass.
The cliffs, lapped by a crystal-clear sea, remind her of Capri.
2 adj If you say that a message or statement is crystal clear, you are emphasizing that it is very easy to understand.
usu v-link ADJ (emphasis)
The message is crystal clear<endash>if you lose weight, you will have a happier, healthier, better life...
liquid crystal (liquid crystals plural )A liquid crystal is a liquid that has some of the qualities of crystals, for example reflecting light from different directions in different ways. n-count
liquid crystal display (liquid crystal displays plural ), liquid-crystal display A liquid crystal display is a display of information on a screen, which uses liquid crystals that become visible when electricity is passed through them. n-count
(=LCD)