- Quicksilver is an archaic name for the chemical element mercury. Literally "living silver," from mercury's silver appearance and its unusual (for a metal) liquidity at room temperature.
- Quicksilver is a novel by Neal Stephenson.
- Quicksilver is a comic book superhero in the Marvel Comics universe, his superhuman ability being super-speed and reflexes. Created by Stan Lee and Jack Kirby, he first appeared in X-Men #4 (1962).
- Quicksilver is a clothes brand specialized in surfing and snow sports.
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