| 1 | Ancient Greek | ὀστέον | bone; bones of the earth = rock; stone of fruit |
| 2 | Ancient Greek | κλάσις | breaking, fracture; bending of the knee joint,... |
| 3 | Ancient Greek | -σῐς | "suffix forming nouns" |
| 4 | Ancient Greek | -τις | Earlier form of -σις , retained after dentals δ,... |
| 5 | Proto-Indo-European | -tis | Derives abstract/action nouns from verb roots |