The spelling of the word "anesthyl" is unique and can be explained using IPA phonetic transcription. The word is pronounced as /əˈnɛsθil/, with the first syllable "an" pronounced as a schwa sound, followed by "es" pronounced as /ɛs/ and "thyl" pronounced as /θɪl/. The "e" in "es" represents the vowel sound pronounced as /ɛ/, while the "y" in "thyl" changes the "th" sound to /θ/ and represents the vowel sound pronounced as /ɪ/. The spelling of "anesthyl" follows the principle of English orthography, which can present pronunciation challenges for non-native speakers.
A local anesthetic mixture of methyl chloride 1, and ethyl chloride 5.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.