zodiac-signhttp://www.oed.com/dictionary/zodiac-sign_n%3Ftab%3Dmeaning_and_usezodiac-sign, n.
First published 1921; not fully revised

zodiac-signnoun

  1. 1883–
    1. 1883
      The similar zodiac-signs of the Old World.
      Encyclopædia Britannica vol. XVI. 212/2

Originally published as part of the entry for zodiac, n.

zodiac, n. was first published in 1921; not fully revised.