[8]. 1. Rhotacism. An original s between vowels became r; as,—
arbōs, Gen. arboris (for arbosis);
genus, Gen. generis (for genesis);
dirimō (for dis-emō).
2. dt, tt, ts each give s or ss; as,—
pēnsum for pend-tum;
versum for vert-tum;
mīles for mīlet-s;
sessus for sedtus;
passus for pattus.