>I'm wondering if Romanian word Pietroasele have diminutive
>suffix -ele?
No, -e-le are the following endings: -e for the plural of <pietroasa> (which
is a feminine noun; the masculine would be <pietros>, <pietro$i>); -le is
the definite article, here the plural (the masculine is -l <pietrosul>,
plural -i <pietro$ii>. In Romanian, these articles are always post-positioned.
Otherwise, they would be as in other Romance languages: *a pietroasa,
*le pietroase, *'l pietros, *i pietro$i.
g