ETYM Latin mercurialis, from Mercurius Mercury: cf. French mercuriel.
1. Being of a changeable, fickle nature.
2. Relating to or containing or caused by mercury.
3. Volatile; fluctuating.
4. Pertaining to or containing mercury; lively in mind; volatile. mercurous.
1. Relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
2. Relating to or under the (astrological) influence of the planet Mercury
(Archaic) A medical preparation containing mercury.