Comparative evidence

2.rei̯g, 2.rei̯ǵ

• Lat. rigeō -ēre ‘be stiff’, ‘rigid’, ‘unbending’, ‘be stiffly erect’, ‘stand up’ (OLD: 1654)

References

OLD = Glare, P. G. W. 1968. Oxford Latin Dictionary. Oxford: Clarendon Press.