The suffix continues both Proto-Indo-European *-tós and *-tus. A distinguishing feature between the two is that lemmas formed with the u-stem suffix, later were extended with *-kъ, e.g. Serbo-Croatian podátak (“datum”) < *datъ (“load, something given”).
- Deverbal from mono-syllabic simple stems, forms passive participles
- Synonym: *-nъ
- From ū-grade root:
- From ī-grade root:
- From nasal-grade root:
- Deverbal, forms nouns (usually with o-grade)