methylchloroisothiazolinone

/ˌmɛθɪlˌklɔːɹəʊˌaɪsəʊˌθaɪəˈzəʊlɪnəʊn/

noun

A synthetic preservative used in many cosmetics, personal care products and cleaners to stop bacteria, mold and fungi. It is effective at very low concentrations but is also a known cause of skin irritation and allergic contact dermatitis in some people. It is often used together with methylisothiazolinone.

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Meanings

nounmethylchloroisothiazolinone (uncountable, abbreviation MCI)

abbreviation MCI

  1. uncountablechemistryA synthetic preservative used in many cosmetics, personal care products and cleaners to stop bacteria, mold and fungi. It is effective at very low concentrations but is also a known cause of skin irritation and allergic contact dermatitis in some people. It is often used together with methylisothiazolinone.

Origin

From methyl + chloro- + isothiazolinone

Full word history & related roots →
Cite this entry
APA

methylchloroisothiazolinone. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/methylchloroisothiazolinone

MLA

“methylchloroisothiazolinone.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/methylchloroisothiazolinone. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “methylchloroisothiazolinone,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/methylchloroisothiazolinone.

Source: methylchloroisothiazolinone on Wiktionary, CC BY-SA 4.0.