The spelling of the word "augnathus" can be explained using the International Phonetic Alphabet (IPA) transcription. The word is pronounced /ɔːɡnæθəs/ with the stress on the second syllable. The "a" in "aug" is pronounced as the vowel in "law", the "gn" is silent, and the "th" is pronounced with the tongue between the teeth as in "earth". "Us" is pronounced as the schwa sound and the stress is on the second syllable. Overall, the spelling of "augnathus" accurately reflects its pronunciation.
A monster with a double mandible.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
There doesn't appear to be any specific information available regarding the etymology of the word "augnathus". It is possible that this is a term used in a specific context or a rare word that may not have gained widespread usage, leading to limited documentation on its etymology.