Mercury

noun7

1. •
   The first planet in the Solar system with the closest orbit to the Sun, named after the god; represented by ☿.
2. •
   (no longer used) Quicksilver, mercury. (No longer capitalized, as the name of the metal is no longer recognized as that of the planet.)
3. •
   (no longer used) A carrier of tidings.
4. •
   (no longer used) A newsboy, a messenger.
5. •
   (no longer used) Someone who carries messages between lovers; a go-between.
6. •
   (no longer used) A newspaper.

   • No allusion to it is to be found in the monthly Mercuries. — 1849
7. •
   (no longer used) A footman.

   • Enter Mr. Tulkinghorn, followed by Mercuries with lamps and candles. — 1852