The word "extispicious" is not a commonly used word in English. It is spelled with the prefix "exti-" which means "entrails" and "auspicious," meaning something that is favorable or promising. Its pronunciation is ɛkstɪˈspɪʃəs. The IPA phonetic transcription shows that the first syllable is pronounced with stress and the "p" in "spicious" is silent. Overall, the spelling of "extispicious" may seem unusual, but it follows the rules of morphology and etymology.
The word "extispicious" does not have an established etymology as it appears to be a neologism or a combination of existing words. It is not listed in recognized English dictionaries and is not widely used in the English language. Therefore, it does not have a clear etymology.