- [M-] of Mercury (the god or planet)
- of or containing mercury
- caused by the action or use of mercury
- having qualities attributed to the god Mercury or supposedly influenced by the planet Mercury; eloquent, clever, shrewd, thievish, etc.
- having qualities suggestive of mercury; quick, quick-witted, volatile, changeable, fickle, etc.
Origin of mercurialMiddle English from Classical Latin mercurialis