A prefix meaning 'containing chlorine' or 'green,' used in chemical and biological nomenclature.
From Greek khlōros (greenish-yellow), this ancient color term was adopted by modern chemistry to denote chlorine-containing compounds and green-pigmented structures.
The prefix chloro- connects ancient Greek color vocabulary to modern chemistry—'chlorophyll' (the green pigment in plants) literally means 'green leaf' in Greek, yet it's essential for feeding all life on Earth.
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