Irish fios

← Proto-Celtic *wissus (inherited)

← Proto-Indo-European *weyd- (root)

← Proto-Indo-European *wéydtus (inherited)

← Proto-Indo-European *weyd- (mention)

← Old Irish fis (inherited)

← Old Irish fius (mention)

→ Irish féinfhios (affix)

→ Irish comhfhios (affix)

→ Irish feasacht (affix)

→ Irish uilefhios (affix)

→ Irish fioscaireacht (blend)

→ Irish ainbhios (prefix)

→ Irish ainbhiosán (affix)

→ Irish fiosraigh (suffix)