quicksilver:1

noun
quick*sil*ver \ ˈkwik-ˌsil-vər \
before 12th century
  • mercury

quicksilver:2

adjective
quicksilver \
1655
  • resembling or suggestive of quicksilver; especially : mercurial

mercury

noun
mer*cu*ry \ ˈmər-kyə-rē \ -k(ə-)rē \
14th century{ds||1|a|}
  • a Roman god of commerce, eloquence, travel, cunning, and theft who serves as messenger to the other gods
  • a bearer of messages or news or a conductor of travelers
  • a silver-white poisonous heavy metallic element that is liquid at ordinary temperatures and is used especially in batteries, in dental amalgam, and in scientific instruments —called also quicksilver
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