Etymology
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hydrargyrum (n.)

"mercury, quicksilver," 1560s, from Latin hydrargyrus, from Greek hydrargyros "quicksilver" (as prepared artificially from cinnabar ore; native quicksilver was argyros khytos "fused silver"), from hydr-, stem of hydor "water" (from suffixed form of PIE root *wed- (1) "water; wet") + argyros "silver" (from PIE root *arg- "to shine; white," hence "silver" as the shining or white metal). Hence the chemical abbreviation Hg for the element mercury.

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Definitions of hydrargyrum

hydrargyrum (n.)
a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures;
Synonyms: mercury / quicksilver / Hg / atomic number "
From wordnet.princeton.edu