The Spanish word 'cloración' (chlorination) comes from combining 'cloro' (chlorine) with the suffix '-ción' (which forms nouns indicating an action or process). The root 'cloro' itself traces back to the Ancient Greek word 'χλωρός' (khlorós), meaning 'pale green' - a reference to the yellowish-green color of chlorine gas. The suffix '-ción' is used to transform the base word into a noun describing the process of adding chlorine to something, particularly in water treatment.

Some related Spanish words that might be easier to recognize include 'cloro' (chlorine) itself, which is more commonly encountered in everyday Spanish. You might also see 'clorar' (to chlorinate) or 'cloruro' (chloride). These all share the same Greek root referring to the distinctive pale green color of chlorine.

English speakers can easily connect this word to several familiar terms like 'chlorine', 'chlorinate', and 'chlorination'. The English word 'chlorophyll' (the green pigment in plants) also comes from the same Greek root 'χλωρός' (khlorós), combining the idea of 'green' with 'phyllon' (leaf). Even the word 'chloral' (a sedative) shares this etymology, though its meaning has diverged significantly from the original color reference.