- (5th BC Attic): IPA: /ártʰron/
- (1st BC Egyptian): IPA: /ártʰron/
- (4th AD Koine): IPA: /árθron/
- (10th AD Byzantine): IPA: /árθron/
- (15th AD Constantinopolitan): IPA: /áɾθɾon/
Note concerning definition #2, ἄρθρον was sometimes used to refer to various body parts such as the ankles, eyes, mouth, genitals, etc.