chromosphere
n.
1868, coined by English astronomer Sir Joseph Norman Lockyer (1836-1920), from chromo-, from Greek khroma "color" (see chroma) + sphere. So called for its redness.
〔李〕n.（太阳的）色球层 [sphere=a globular shell] ←chromo-，chromato-[GK] =colour色；chromatin染色质