'Historionomer' definitions:

Definition of 'Historionomer'

From: GCIDE

Historionomer \His*to`ri*on"o*mer\, n. [Gr. ? history + ? to distribute.] One versed in the phenomena of history and the laws controlling them. [1913 Webster]
And historionomers will have measured accurately the sidereal years of races. --Lowell. [1913 Webster]