English

interresidual

From inter- + residual.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *sed- ‘to sit’

…

Latin resideō ‘to remain behind’

Latin residuus ‘remaining, left over’

Latin residuum ‘a remainder’

Old French residu

Today it means

adj Between residues.

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

Etymograph / interresidual