The word "avoutrie" is an archaic spelling of "adultery". It is pronounced /əˈvʌɪtrɪ/ according to IPA phonetic transcription. The first syllable "a" is pronounced as schwa sound /ə/ followed by "vo" sound /vʌ/ and "trie" ending with a short "i" sound /ɪ/. This spelling was commonly used in Middle English and has since evolved to the modern spelling of "adultery". Despite its irregular spelling, "avoutrie" still carries the same meaning as the modern spelling.
Adultery.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
There is limited information available regarding the etymology of the word "avoutrie". It appears to be a variant or an obsolete form of the word "adultery", which refers to the act of being unfaithful to a spouse or partner by engaging in sexual relations with someone outside the marriage. The term "adultery" itself comes from the Latin word "adulterium", which means "voluntary sexual intercourse between a married person and someone who is not their spouse". The word "adultery" has been in use since the 14th century, while "avoutrie" seems to be an earlier form.