- (5th BC Attic): IPA: /ɡastɛ͜ɛ́r/
- (1st BC Egyptian): IPA: /ɣastéːr/
- (4th AD Koine): IPA: /ɣastír/
- (10th AD Byzantine): IPA: /ɣastír/
- (15th AD Constantinopolitan): IPA: /ɣastíɾ/
The root of γαστήρ contains an ε between τ and ρ which is often syncopated, leading to alternate forms such as genitive singular: γαστέρος and γαστρός, dative singular: γαστέρι and γαστρί, dative plural: γαστῆρσι and γαστράσι. The syncopated form is generally more common in forms with long suffixes, such as the aforementioned. The inflection table below lists the more common forms.