The story
- Proto-Hellenic*kʰrṓwmə
- Ancient Greekχρῶμᾰ (khrômă)
- Englishchromo-
- Ancient Greekσφαῖρᾰ (sphaîră)
- Latinsphaera
- Late Latinsphēra
- Old Frenchsphere
- Middle Englishspere
- Englishsphere
- Englishchromosphere
- English todaychromospheric
From chromosphere + -ic.
Etymology from Wiktionary, CC BY-SA 4.0.