The Collaborative International Dictionary
Equiponderant
Equiponderant \E`qui*pon"der*ant\, a. [Cf. F. Being of the same weight.
A column of air . . . equiponderant to a column of
quicksilver.
--Locke.
Wiktionary
equiponderant
a. (context obsolete English) Having equal weight. alt. (context obsolete English) Having equal weight.