English

interbinary

From inter- + binary.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *dwóh₁ ‘two’

…

Proto-Italic *dwiznos

Latin bīnus ‘occurring twice, twofold, double, binary’

Late Latin bīnāriu

Middle English binarie

Today it means

adj Between the components of a binary star.

Language periods are conventional ranges, not dates for this word.

Etymograph / interbinary