The word "paristhmitis" may be a challenge to spell, but breaking it down phonetically can help. Here is the IPA transcription: /pəˌrɪsˈθmaɪtɪs/. The first syllable "pa" is pronounced with the schwa sound "ə". The second syllable "ris" has the "ɪ" vowel sound. The third syllable "thmi" is more complex, with the "θm" combination representing a voiceless dental fricative followed by a labial nasal. The final syllable "tis" is straightforward, with a short "i" and an unvoiced "t".
Amygdalitis, inflammation of the tonsil.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.