Tonophant is a word that has a unique spelling with an interesting origin. It comes from the Greek words "tonos" meaning tension or pitch, and "elephant" referring to the large animal. The correct pronunciation can be written in IPA as /tɑnəˌfænt/. The "t" is pronounced as a hard "t" sound followed by a short "o" and "n" sound. The "ph" is pronounced as an "f" sound and "ant" is pronounced as "uhnt". Overall, it's a fascinating word with a phonetic makeup that's somewhat unexpected.
An instrument for visualizing sound waves.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.