Pokorny suggests a derivation from Proto-Indo-European *h₂énHteh₂ (“doorjamb, doorpost”), which has continued to be accepted by later linguists. Cognates include Sanskrit आता (ā́tā, “door frame”), Avestan 𐬀𐬌𐬚𐬌𐬌𐬁 (aⁱθiiā, “doorpost”), Old Armenian դրանդի (drandi, “doorpost, threshold”), Proto-Germanic *andō (“vestibule, porch”).