| 1 | Ancient Greek | ἀρθρῖτις | f, "third"; of or in the joint |
| 2 | Ancient Greek | ἄρθρον | joint; limb; articulation |
| 3 | Ancient Greek | ἀραρίσκω | join, fasten; fit together, construct; fit,... |
| 4 | Ancient Greek | -σκω | Primitive suffix used to form present-tense... |
| 5 | Proto-Indo-European | -sḱéti | Forms durative or iterative imperfective verbs... |