Words that come from Proto-Indo-European “temH-(e)s-ro-”
41 words across 14 languages descend from Proto-Indo-European temH-(e)s-ro- — including tenebrous, Tenebrae, tenebrosity, tenebrose, tenebrously, tenebrousness, Tenebrist, tenebricose.
See the etymology of temH-(e)s-ro- itself →