mercurial

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UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/mɜːrˈkjʊəriəl/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/mərˈkjʊriəl/ ,USA pronunciation: respelling(mər kyŏŏrē əl)


WordReference Random House Learner's Dictionary of American English © 2020
mer•cu•ri•al /mərˈkyʊriəl/USA pronunciation   adj. 
  1. changeable;
    varying;
    erratic:a mercurial nature; a mercurial mood.

WordReference Random House Unabridged Dictionary of American English © 2020
mer•cu•ri•al  (mər kyŏŏrē əl),USA pronunciation  adj. 
  1. changeable;
    volatile;
    fickle;
    flighty;
    erratic:a mercurial nature.
  2. animated;
    lively;
    sprightly;
    quick-witted.
  3. Chemistrypertaining to, containing, or caused by the metal mercury.
  4. Mythology(cap.) of or pertaining to the god Mercury.
  5. Astronomy( cap.) of or pertaining to the planet Mercury.

n. 
  1. Drugs[Pharm.]a preparation of mercury used as a drug.
mer•cu ri•al•ly, adv. 
mer•cu ri•al•ness, mer•cu′ri•ali•ty, n. 
  • Latin mercuriālis of, pertaining to the god or planet Mercury. See mercury, -al1
  • Middle English 1350–1400
    • 1.See corresponding entry in Unabridged . inconstant, indecisive.
    • 2.See corresponding entry in Unabridged . spirited.
    • 1.See corresponding entry in Unabridged . constant, steady.
    • 2.See corresponding entry in Unabridged . phlegmatic.

Collins Concise English Dictionary © HarperCollins Publishers::
mercurial /mɜːˈkjʊərɪəl/ adj
  1. of, like, containing, or relating to mercury
  2. volatile; lively: a mercurial temperament
  3. (sometimes capital) of, like, or relating to the god or the planet Mercury
n
  1. any salt of mercury for use as a medicine
Etymology: 14th Century: from Latin mercuriālis

merˈcurially adv merˈcurialness, merˌcuriˈality n
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