Etimoloji
Etymology tree Proto-Indo-European *h₂er- Proto-Indo-European *-éh₁ti Proto-Indo-European *h₂reh₁- Proto-Indo-European *-éyti Proto-Indo-European *h₂rey-der. Ancient Greek ᾰ̓ρῐθμός (ărĭthmós)der. Polish arytmo- Derived from Ancient Greek ᾰ̓ρῐθμός (ărĭthmós).