residual

¹re·sid·u·al

adj \ri-ˈzij-(ə-)wəl, -ˈzij-əl\

Definition of RESIDUAL

1

: of, relating to, or being something that remains: as a : remaining after a disease or operation <residual paralysis> b : remaining in a body cavity after maximum normal expulsion has occurred <residual urine>—see residual volume

2

a : leaving a residue that remains effective for some time after application <residual insecticides> b : of or relating to a residual insecticide <a residual spray>