residuo
/reˈsidwo/ · B2 · noun · m
remainder
🗑️ residuo = re- (back) + sedere (sit): what sits left behind
From Latin residuum, from residere, 're-' (back) + 'sedere' (to sit). Residue is what stays seated after the rest has gone. Sounds like English 'residue', so the link is direct: leftover, remainder, waste.