What is the meaning of Mercurial?

Any of the plants known as mercury, especially the annual mercury or French mercury (Mercurialis annua).

A person born under the influence of the planet Mercury; hence, a person having an animated, lively, quick-witted or volatile character.

A chemical compound containing mercury.

A preparation of mercury, especially as a treatment for syphilis.

Having a lively or volatile character; animated, changeable, quick-witted.

Pertaining to the astrological influence of the planet Mercury; having the characteristics of a person under such influence (see adjective sense 1).

Pertaining to the planet Mercury.

Of or pertaining to the element mercury or quicksilver; containing mercury.

Caused by the action of mercury or a mercury compound.

Pertaining to Mercury, the Roman god of, among other things, commerce, financial gain, communication, and thieves and trickery; hence , money-making; crafty.

mercurial, pertaining to mercury (metal)

A plant belonging to the genus Chenopodium; a goosefoot.

mercurial; pertaining to or under the influence of the planet Mercury

mercurial

mercurial

Source: wiktionary.org