The word "Gnathonical" is not a commonly used word, but it may refer to something related to the jaw or jawbone. The spelling of this word can be explained with the use of the International Phonetic Alphabet (IPA) transcription system. The first sound, "gn," represents a consonant cluster, pronounced as a nasalized velar stop. The next sound is "a," pronounced as a short vowel sound. The following "th" represents a dental fricative sound. The final syllable consists of a long "o" sound, followed by "n," pronounced as a nasal consonant.
The word "gnathonical" is derived from the Ancient Greek word "gnathos", meaning "jaw", and the suffix "-ical", which indicates "related to" or "pertaining to". Thus, "gnathonical" refers to something related to or pertaining to the jaw.