Traditionally derived from Proto-Indo-European *deǵʰ- (“liquid, mixture”) and compared with Old Irish deug (“drink, draught, potion”), Welsh diod (“id”); the zero-grade of this root is perhaps found in žuvi̇̀s (“fish”) < *dǵʰ-uH-. This derivation is favored by Kloekhorst, though Smoczynski appears to be implicitly skeptical.