Latin word unguere comes from Proto-Indo-European *h₃engʷ-, Proto-Indo-European *ongw-, and later Latin ungo (I anoint, smear with oil.)
*h₃engʷ- (Proto-Indo-European)
*ongw- (Proto-Indo-European)
*ongʷō (Proto-Italic)
unguo (Latin)
ungo (Latin)
I anoint, smear with oil.