-sis
suffixEtymology Ultimately from Ancient Greek -σις (-sis, “forms noun of action”), often via Latin or French. Identical in meaning with Latin -entia, English -ing.
1
Morpheme forming nouns of action or process
- catharsis, dialysis, diagnosis, crisis
2
Medicine, Sciences Morpheme forming nouns of condition
- psoriasis, sepsis, tuberculosis, psychosis
3
Morpheme forming additional nouns
- basis, oasis, thesis, stasis