The only free and comprehensive online etymological dictionary of the Spanish language
oír (Verb) "to hear"
12th cent. Old Spanish odir. From Latin audire 'id.' From Proto-Italic *awizd-je/o- 'id.' A compound from Proto-Indo-European *h2eu̯-i̯s "clearly" and *dhh1-i̯e/o- "to render." From the root *dheh1- "to put" (see hacer).
Indo-European
Romance
Asturian oyer, Portuguese ouvir, Galician oír, French ouïr, audio, Italian udire, Aromanian avdu, Romanian auzi
Balto-Slavic
Old Church Slavonic avě "manifestly," Bulgarian áve "in reality," Lithuanian ovyje 'id.'
Hellenic
Ancient Greek ᾰ̓ῐ̈́ειν (aíen) "to percieve"
Indo-Iranian
Sanskrit āvíṣ "evidently," Avestan āuuiš 'id.'