Meaning

noun a measure of the quantity of chlorine or other halides in water (especially seawater)

originEtymology tree Ancient Greek χλωρός (khlōrós) Proto-Indo-European *-nós Proto-Indo-European *-iHnos Proto-Italic *-īnos Latin -īnusder. Old French -inbor. Middle English -in English -ine English chlorine Proto-Indo-European *-teh₂ Proto-Indo-European *-ts Proto-Indo-European *-teh₂ts Latin -itāsder. Old French -itebor. Middle English -ite English -ity English chlorinity From chlorine + -ity.

Etymology from Wiktionary, CC BY-SA 3.0