The word "vasotonin" is a difficult word to spell as it is not commonly used in everyday language. The correct spelling for this word is /væsətoʊnɪn/, with the emphasis on the second syllable ('to'). Breaking down the phonetic transcription, the first syllable is pronounced as 'vah-suh', the second syllable is pronounced as 'toh', and the last syllable is pronounced as 'nin'. With this understanding of the word's pronunciation, it becomes easier to spell it correctly.
Trade name of a compound or combination of yohimbin and urethane, recommended in angina pectoris, arteriosclerosis, and to reduce blood-pressure.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.