Enneatic \En`ne*at"ic\, Enneatical \En`ne*at"ic*al\, a. [Gr.
'enne`a nine.]
Occurring once in every nine times, days, years, etc.; every
ninth.
[1913 Webster]
{Enneatical day}, every ninth day of a disease.
{Enneatical year}, every ninth year of a man's life.
[1913 Webster]