The spelling of the word "Swedish gymnastics leech" may seem confusing at first glance, but it can be easily explained using IPA phonetic transcription. The word "Swedish" is pronounced as /ˈswiːdɪʃ/, "gymnastics" is pronounced as /dʒɪmˈnæstɪks/, and "leech" is pronounced as /liːtʃ/. When these three words are merged together, the resulting word is spelled as "Swedish gymnastics leech". While the word may look daunting to spell, knowing its IPA transcription makes it easier to understand and use correctly.
Hirudo medicinalis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.