Meaning of quicksilver

Definition of quicksilver

(adj) liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
(noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

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