say it: ek-STRAY-nee-uhs
extraneous is an adjective meaning "not pertinent to the matter under consideration". It carries 4 recorded senses.
not pertinent to the matter under consideration
“an issue extraneous to the debate”
“the price was immaterial”
“mentioned several impertinent facts before finally coming to the point”
not essential
“the ballet struck me as extraneous and somewhat out of keeping with the rest of the play”
not belonging to that in which it is contained; introduced from an outside source
“water free of extraneous matter”
“foreign particles in milk”
Definitions, synonyms and semantic relations for extraneous 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.