Here you will find one or more explanations in English for the word Historionomer.
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Historionomer
Historionomer His*to`ri*on"o*mer, n. [Gr. ? history + ? to
distribute.]
One versed in the phenomena of history and the laws
controlling them.
And historionomers will have measured accurately the
sidereal years of races. --Lowell.
Meaning of Historionomer from wikipedia