The Collaborative International Dictionary of English v.0.48:

Novercal \No*ver"cal\, a. [L. novennis of nine years; novem nine
   + annus year.]
   Done or recurring every ninth year.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Novercal \No*ver"cal\, a. [L. novercalis, from noverca a
   stepmother.]
   Of or pertaining to a stepmother; suitable to, or in the
   manner of, a stepmother. --Derham.
   [1913 Webster]