Mercurial Definition

mər-kyo͝orē-əl
adjective
Of Mercury (the god or planet)
Webster's New World
Of or containing mercury.
Webster's New World
Having qualities attributed to the god Mercury or supposedly influenced by the planet Mercury; eloquent, clever, shrewd, thievish, etc.
Webster's New World
Caused by the action or use of mercury.
Webster's New World
Having qualities suggestive of mercury; quick, quick-witted, volatile, changeable, fickle, etc.
Webster's New World
noun
A drug or preparation containing mercury.
Webster's New World

(astrology) Someone born under the influence of Mercury. [from 16th c.]

Wiktionary

Other Word Forms of Mercurial

Noun

Singular:
mercurial
Plural:
mercurials

Origin of Mercurial

  • Middle English of the planet Mercury from Latin mercuriālis of the god or planet Mercury from Mercurius Mercury

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Anglo-Norman / Old French mercurial, and their source, Latin mercurialis, from Mercurius (“Mercury").

    From Wiktionary

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