From French, kilo- irregularly derived from χίλιοι (chilioi ) "one thousand". The "correct" form would be chili-, resulting in forms such as chiliasm. But the French, when creating the prefix had to avoid a possible (standard) pronunciation of chi as IPA(key): /ʃi/, too close to the vulgar verb chier.
కిలో- • (kilō-)
- In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 1,000.