According to Wikipedia,
Romanian has [...] the glottal fricative /h/.
You can hear it, for instance, in the Romanian word arhaic.
This cannot be of Latin origin because, as explained in the book La filologia romanza by Pietro G. Beltrami, Latin /h/ was lost everywhere in the Romance domain and has left no trace in the Romance languages. So I suppose that this /h/ was acquired at a certain point in the history of Romanian. Can someone explain this? Is that to be attributed to the Slavic superstratum?