Source : Webster's Revised Unabridged Dictionary (1913)

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

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.