But its lack of a Proto-Indo-European thematic vowel (o or e) and of any nominative singular ending (ordinarily -s or -os) doesn't neatly place it within either of the Proto-Indo-European nominal categories, thematic and athematic.
But its absence of a Proto-Indo-European thematic vowel (o or e) and lack of any nominative singular ending (ordinarily -s or -os) doesn't neatly categorize it within either the thematic or athematic Proto-Indo-European nominal categories.