Meaning of “untreated” in the English Dictionary

"untreated" in British English

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uk /ʌnˈtriː.tɪd/ us /ʌnˈtriː.t̬ɪd/

An untreated substance is not cleaned and has not had special substances added to protect it or make it safe to use:

untreated water/sewage/waste
This wood is vulnerable to water damage because it's untreated.

Untreated illnesses, injuries, people, or animals do not receive medical treatment:

It is a form of anaemia which is nearly always fatal if left untreated.

(Definition of “untreated” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"untreated" in American English

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us /ʌnˈtri·t̬ɪd/

untreated adjective (WITHOUT MEDICINE)

not given medical treatment:

Depression is a very treatable disease but if left untreated it can be deadly.

untreated adjective (NOT PROCESSED)

not changed, improved, or made safe by a special process:

untreated wood/fabric
Up to 80 times a year, the untreated overflow from the factory is dumped into the river.

(Definition of “untreated” from the Cambridge Academic Content Dictionary © Cambridge University Press)