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Relating to or of the nature of a residue.
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re·sid·u·al ri-'zij-(ə-)wəl, -'zij-əl adj
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>
residual n
1) an internal aftereffect of experience or activity that influences later behavior
2) a residual abnormality (as a scar or limp)
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re·sid·u·al (re-zidґu-əl) [L. residuus] remaining or left behind.Medical dictionary. 2011.