Fifth declension. Among variant declensional forms are known: sg. dat. -i, -: akmeni, akmenie, seseri, seserie. Sg. gen. akmenes, pl. nom. akmenes, akmens. In a case of Old Prussian emen – name, e is dropped in other than sg. nom. cases (sg. acc. emnin instead of emenin). A drop can similarly occur in other languages, for example: Lith. vanduo – water, sg. gen. variants: vandens, vandenies, vandinies, vandenio, vandinio, vandnio. Gothic wato "n" – water: pl. forms, for example, nom.-acc. watna.