- Place: river Vomano, province Teramo, region Abruzzo, Italy
- Name: Vomanus fl. (Plin.)
- Etymology: The name was considered pre-IE [DNGI, p. 583] and compared with the Roman personal name Vomanius. However, the hydronym can be related to the IE root *ueme- 'to spit, vomit', as a translate. It would then be a cognate of Latin vomeo 'I vomit', via a deverbal form *ueme-no- 'the vomiter (of water)'.
The linguistic affiliation of the Piceni has always been disputed. Usually, they are considered as belonging to the Eastern Italic (or Osco-Umbrian) group, just for the geographical proximity. Actually, the typical phonetic features of that linguistic group (intervocalic f, labialization of kw, gw, etc.) are lacking in the toponymy of the area. On the contrary, clear non-Eastern Italic features appear to be dominant. Some of them (like *bh>b, etc. in every position) can be explained in several ways (for example invoking the Western Italic). But the hypothesis proposed here is that of a linguistic stratum, possibly very ancient since it is responsible of the hydronymy, characterized by a consonant shift. There is evidence of the voiced stops shifting to voiceless (*d>t, *g>k and presumably *b>p), and of the aspirated voiced stops shifting to voiced (*bh>b etc.). The voiceless stops were preserved or maybe, to complete the shift, they were aspirated, but this aspiration is not shown in the Latin sources, since Latin language had not aspirated voiceless stops in its alphabet. This unknown language is only a speculation. Conventionally, it will be referred to in the languages' page, as Picene (the so-called Picene alphabets seem to have had aspirated voiceless stops).
An Italic presence is also needed to explain some placenames with initial f or h and it is especially concentrated in the valley of river Tronto (Truentus fl.), maybe the first point from which these Italics, avoiding Picenes north and south, propagated toward the western coast of Italy. It is not clear whether this stratum is a (Western) Italic one or a part of the Osco-Umbrian group.
Possibly, an example of a Gaulish toponymy has been found, not far from the Ager Gallicus in the north of the region.