The spelling of the word "coryfin" may seem unusual, but it can be easily explained with IPA phonetic transcription. The first syllable is pronounced as "kɔrɪ," with the 'o' sounding like the 'o' in "corn" and the 'i' producing a short 'ih' sound. The second syllable is pronounced as "fɪn," with the 'i' producing a long 'ee' sound and the 'n' being pronounced as normal. The combination of these two syllables creates the unique spelling of "coryfin."
The ethyl glycolic acid ester of menthol; a colorless oily fluid recommended as a substitute for menthol as an external application in headache, coryza, and catarrhal affections of the pharynx and nasopharynx.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.