chlor(o)-

The colour green.

Greek khlōros, green.

The pigment in plants that absorbs sunlight, chlorophyll (Greek phullon, leaf), is so called because it is green; it is held in the leaves in chloroplasts, which contain the plant's photosynthetic machinery. The gaseous element chlorine was named in 1810 by the chemist Sir Humphry Davy (1778–1829) because it is greenish-yellow; chloro‑ can refer to chemical compounds containing chlorine, such as chlorides, the salts of hydrochloric acid; the anaesthetic chloroform; and the anti-malaria drug chloroquine.