say it: REZ-uh-doo
residue is a noun meaning "matter that remains after something has been removed". It carries 2 recorded senses.
matter that remains after something has been removed
something left after other parts have been taken away
“there was no remainder”
“he threw away the rest”
“he took what he wanted and I got the balance”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for residue come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.