The Collaborative International Dictionary
Equipondious
Equipondious \E`qui*pon"di*ous\, a. [L. aequipondium an equal
weight; aequus equal + pondus weight.]
Of equal weight on both sides; balanced. [Obs.]
--Glanvill.
Wiktionary
equipondious
a. (context obsolete rare English) Of equal weight on both sides; balanced.