Comparative evidence

bʰeru̯

• Lat. ferueō -ēre ‘be intensely hot’, ‘be warm with vital heat’, ‘be turbulent’, ‘be active’, ‘be busy’, ‘be roused’, ‘be eager’ (OLD: 692)

• Lat. feruō -ere = ferueō, -ēre (OLD: 693)

References

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