1. ulcus — de Vaan
ulcus 'ulcer', assuming a semantic development 'to grow sores (against someone)' > 'avenge one's griefs'. This is not compelling either (cf Keller 1992: 257). Schrijver is reluctant to accept an equation with Gr. όλέκω 'to destroy', a ^-enlargement to the root *h3lhr; but semantically, this seems the best option. PIE *h3lhrk- would yield Lat. *M- according to Schnjver's rules (1991: 304ff,), but *h3olhrlo > *hsolk- … — [de Vaan, s.v. ulcus, p. 651]