neros

noun2

1. •
   A period of 600 years.

   • the progressive subdivisions of the saroses of 3,600 years, of the neroses of 600 years, and of the sosses [sic] of 60 years have the same progression as the divisions and subdivisions of the zodiac — 1872
2. •
   (no longer used, rare) One sixth of a saros, or about three years.