yidis is masculine in Spanish.
Yiddish (a West Germanic, or more specifically High German, language that developed from Middle High German dialects, with an admixture of vocabulary from multiple source languages including Hebrew-Aramaic, Romance, Slavic, English, etc., and mostly written in Hebrew characters which is used mainly among Ashkenazic Jews from central and eastern Europe)
Etymology tree Proto-Semitic *yad- Hebrew יָדָה (yadá) Hebrew יהודהder. Ancient Greek Ἰουδά (Ioudá) Proto-Indo-European *-yósder. Ancient Greek -ιος (-ios) Ancient Greek Ἰουδαῖος (Ioudaîos)bor. Latin iūdaeusder. Old High German judeo Proto-Indo-European *-iskos Proto-Germanic *-iskaz Proto-West Germanic *-isk Old High German -isc Old High German judeisc Middle High German jüdesch Yiddish ייִדיש (yidish)bor. Spanish yidis Borrowed from Yiddish ייִדיש (yidish).