The story
- Proto-Indo-European*h₁rewdʰ-
- Proto-Indo-European*h₁rudʰrós
- Proto-Hellenic*erutʰrós
- Ancient Greekἐρῠθρός (erŭthrós)
- Englisherythro-
- Ancient Greekκῠ́τος (kŭ́tos)
- Latincyta
- Englisherythrocyte
- English todayerythrocytosis
From erythrocyte + -osis.
Etymology from Wiktionary, CC BY-SA 4.0.