The word "nestiostomy" is spelled with the prefix "n-" followed by "estiostomy". The "es-" is pronounced as "eh-s" and the "tio" as "tee-oh", resulting in "eh-stee-oh-stomy". IPA phonetic transcription for "nestiostomy" is /nɛstiːɒstəmi/ where the first syllable is pronounced "neh-stee" with a long "e" sound, second syllable is "oh" as in "btown", third syllable is "os" as in "boss" and fourth syllable is pronounced "tuh-mee" with a short "i" sound.
The operative establishment of a fistula opening into the jejunum, jejunostomy.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.