n.
Pronunciation: är- ' thr ō -s ə s
Function: noun
Inflected Form: plural -thro · ses \ - ˌ s ē z \
Etymology: New Latin, from Greek arthr ō sis jointing, articulation, from arthroun to articulate, from arthron
Date: 1634
1 : an articulation between bones
2 : a degenerative disease of a joint