The term "narcosises" is spelled with three "s" at the end. This is due to the plural form of the word "narcosis" which means a state of unconsciousness induced by drugs. In IPA phonetic transcription, it is pronounced as /nɑrkəsəsiz/. The "-osis" suffix in the singular form changes to "-oses" in the plural to indicate multiple occurrences. Thus, while it may be challenging to spell, understanding the rules of pluralization in English can help with such tricky words.
The word "narcosises" does not have an established etymology as it is not a commonly used or recognized term. It seems to be a plural form of "narcosis", which is derived from the Greek word "narkōsis", meaning "numbness" or "torpor". The term "narcosis" is used to describe a state of unconsciousness or insensibility caused by drugs or anesthesia. However, "narcosises" itself is not a widely recognized word, and it may be a less common or possibly incorrect usage.