Outcomings

Just a question: is the term 'outcoming' right to describe a sound or even a
word derived from another? I'm translating a grammar of my dialect, here's a
piece of it:

<<). In a closed syllable the outcoming can be u (promptu > prunt; ordo >
urdin; cepulla > scigula; curte > curt; gutta > guta; ne gutta > nagutt CM;
furnu > furnu; crusta > crusta; pulvere > pulvar; vulpe > vulp; dulce >
dulz; ung(u)la > ungia) or ü (spongia > spügna; pullu > püj; nos > nün; vos
> vü; duo > düü). >>
BTW, if you want to see how much can a sound change be *irregular* you only
have to take a look at Lombardian dialects.

Luca