RESIDUAL

I. noun Etymology: Latin residuum residue Date: 1557 remainder , residuum : as, the difference between results obtained by observation and by computation from a formula or between the mean of several observations and any one of them, a ~ product or substance, an internal aftereffect of experience or activity that influences later behavior, a payment (as to an actor or writer) for each rerun after an initial showing (as of a TV show), II. adjective Date: 1570 of, relating to, or constituting a residue, leaving a residue that remains effective for some time , ~ly adverb