arthrosis1

[ahr-throh-sis] /ɑrˈθroʊ sɪs/
noun
1.
Anatomy. junction of two or more bones of the skeleton; joint.
Origin
1625-35; < Greek árthrōsis joining, articulation, equivalent to arthrō- (variant stem of arthroûn to fasten by a joint; see arthro-) + -sis -sis

arthrosis2

[ahr-throh-sis] /ɑrˈθroʊ sɪs/
noun
1.
Pathology. degenerative joint disease.
Origin
arthr- + -osis
arthrosis in Medicine

arthrosis ar·thro·sis (är-thrō'sĭs)
n. pl. ar·thro·ses (-sēz)

  1. An articulation between bones.

  2. A degenerative disease of a joint.