The word "FSAUS" doesn't seem to exist in English vocabulary. The spelling of this word could be broken down into its phonetic transcription using the International Phonetic Alphabet (IPA) as /ɛfɛsɑʊs/. The first two letters "EF" stand for the English alphabet "F" while the next three letters "SAU" sound like the word "sow" (a female pig) with a short "o" sound. The last letter "S" represents the English alphabet "S". However, it is not clear what this word could mean as it is not found in any dictionary or recognized usage.
I apologize, but there is no dictionary definition available for "FSAUS." It is possible that this is an acronym or abbreviation specific to a particular field, industry, or organization, making it difficult to provide a comprehensive dictionary definition.
However, if you provide some context or additional information about the term "FSAUS," I might be able to offer a more specific explanation or definition. Is "FSAUS" related to a specific subject or industry?