Proto-IE: *(e)reudh-
Meaning: red
Tokharian: A rtär, B ratre (PT *rätre) (Adams 526)
Old Indian: róhita-, lohá-, lóhita- `red, reddish'; rudhirá- `red', n. `blood'; loṣṭa- n. `rust of iron' (L.)
Avestan: raoδita- `rot, rötlich'
Old Greek: eréu̯thō, aor. erêu̯sai̯ `röten, rot farben', éreu̯thos n. `Röte', erüthró- `rot'; erüsíbǟ f. `Rost bei Pflanzen', erüsí-pelas, -tos n. `Erysipelas, Rose, Rosthauf'
Germanic: *riud-a- adj., *raud-a- adj., *rud-a- n., *rud-r-ō f., *riud-a- vb., *rud-ē- vb., *rud-a- adj., *rus-t=, *raus-t=, *rus-mēn, *rud-ja- n., m. Latin: ruber, -bra `rot'; rubor, -ōris m. `Purpur, Röte, Schminke, Scham', rubēre `erröten', rubidus, -a `rot', russus, -a `rot'; rūfus, -a `lichtrot, fuchsrot'; rōbus, -a `rot'; rōbīgō, -inis f. `Rost, Fäulnis; Mehltau, Getreidebrand'
Other Italic: Osk Rufriis, Paelign Rufries `Rubrius'; Umbr rufru `rubrōs', Rufrer `Rubrī'
Celtic: *roud- 'rot' > Gaul Roudus, Andre-roudus EN, OIr ruad; Cymr rhudd
Russ. meaning: красный
References: WP II 358 F
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