PIE *HRHV > Pre-Latin HRVH > Latin RV: (*h1rh1-om-eh2 > Ro:ma)

Consonant-situation:
-----------------------------------
Nom. Lat. sa:l < *seh2ls
Acc. Lat. salem < *sh2elm
Gen. Lat. salis < *sh2los

Laryngeal+Resonant situation:
-----------------------------------
Nom. Lat. *na:ris < *hneh2s
Acc. Lat. *na:rem < *hneh2sm < *hnh2esm (see *sh2elm)
Gen. Lat. *na:ris < *hnh2sos

For the reconstruction with an initial laryngeal of the 'nose'-root
see:
(see Lubotsky - Leiden)
"IE form: Hn(e)h2s- "


The hint here is Latin *na:rem < Pre-Latin Acc. *hneh2sm < PIE Acc.
*hnh2esm- versus the Lat. Acc. salem < PIE Acc. *sh2elm (for a
similar construction)

So we have a laryngeal methathesis in this case *HR/*HV > *HR/*VH

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Rule: PIE *HRHV- > Pre-Latin *HRVH- > Latin RV:
===========================================================

So applying the rule above we can derived Ro:ma in a regular way:

PIE *h1rh1-om-eh2 > Pre-Latin. *h1roh1m-eh2 > Ro:ma

with -om- initially and not with -o:m-

(so the second issue 'why -o:m-?' dissapears too)


The whole clue is the long a: in Lat. Acc. na:rem (Lat. Nom. na:ris)
versus the short a in Lat. Acc. salem (Lat. Nom. sa:l)

Marius