вівторок

Etymology
,, ultimately from. Compare 🇨🇬.

The word likely received prothetic "о" at some point, though the source of this vowel is unknown.

Sometimes alternatively explained as being equivalent to : "(у)въ въторъкъ" → "(у)в овторок" → "(у) вовторок" → "(у) вівторок", though this is much less plausible.

Noun

 * 1) Tuesday