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 eloquent, quickwitted, furtive, or volatile character.
As for [Lambert] Simnell, there was not much in him, more then that hee was a handſome Boy, and did not ſhame his Robes. But this Youth (of whom wee are now to ſpeake) was ſuch a Mercuriall, as the like hath ſeldome beene knowne; and could make his owne part, if at any time hee chanced to bee out.
A chemical compound containing mercury.
Having a lively or volatile character; animated, changeable, quick-witted.
his mercurial temperament
Noun sense 1 (“(obsolete) plant known as mercury”) is from Middle English mercurial, from Anglo-Norman mercurial and Old French mercurial, or directly from their etymon, from Mercurius (“the Roman god...
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Pertaining to the astrological influence of the planet Mercury; having the characteristics of a person under such influence (see adjective sense 1).
The Sun to the Terms of Mercury. It inclineth the native to be Mercurial, given to ſtudy Arts and Sciences, and to delight in reading, and to follow his Calling with chearfulneſs.
Alternative letter-case form of mercurial.