PCelt. *rowesyā ‘field, open ground’ < PIE *(H)rewHos- 'open space' (IEW: 874) The only Celtic reflex mentioned by RM is OIr. róe f. 'level piece of ground, battlefield'. Indo-European cognates are Lat. rūs 'village, countryside', Av. rauuah-, OE rūm 'space, room'. Says RM: “It seems probable that we have to start from a PIE s-stem *(H)rewos / *(H)rewes-os (cf. Lat. rūs). This could have first given *rowes- (with PCelt. *ew > ow) and hence PCelt. *rowesyā.” (RM). But note also Ir. réidh, ré, rae f. 'level plain, field' (DIN, no etymology given): this later form, if related, would then be formally closer to PIE *(H)rewos / *(H)rewes-os. Ranko Matasović. "rowesyā" in: Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. September 2, 2014. < http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/lemma.html?id=17073 >
Robert Farren, PIE culture words collection, 2017
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