Consisting of or relating to two parts or units; binary in nature.
From Latin bi- 'two' + -ous (adjective suffix). A rare, archaic adjective form describing something fundamentally twofold.
This forgotten adjective is a linguistic relic showing how 18th-century scholars loved creating -ous endings for Latin roots—it lost the competition to 'binary' but reminds us that multiple words once competed to describe the concept of twoness.
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