| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| NYI |
| NYI | air. -roind ‘rot färben’ | NYI | .. | LIV TOL |
| NYI | [air. ruidid ‘wird rot, schämt sich’{5} | NYI | .. | LIV TOL |
| NYI | gr. ἐρεύθω ‘röte, färbe rot’{3} | NYI | .. | LIV TOL |
| NYI | gr. ἐρεῦσαι ‘röten’{4} | NYI | .. | LIV TOL |
| NYI | an. (+) rjóða ‘röten (mit Blut)’ | NYI | .. | LIV TOL |
| NYI | ahd. rotēn ‘rötlich sein, erröten’ | NYI | .. | LIV TOL |
| NYI | [lat. rubeō, -ēre ‘rot sein’ | NYI | .. | LIV TOL |
| NYI | [lit. rūdžiù, (rūdė́ti) ‘braun werden, rosten’{6} | NYI | .. | LIV TOL |
| NYI | r.-ksl. rъždu, (rъděti) sja ‘rot werden’ | NYI | .. | LIV TOL |
| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| English | Redhorn | Misty Mountains peak in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | bilirubin | reddish yellow pigment in bile/blood/urine/gallstones | n | AHD W7 LRC |
| English | corroborate | to make more certain, support with evidence/authority | vb.trans | AHD W7 LRC |
| English | erythema | abnormal skin redness | n | AHD W7 LRC |
| English | erythr(o)- | red | pfx | AHD LRC |
| English | rambunctious | boisterous, disorderly | adj | AHD LRC |
| English | red | re: color red (long-wavelength visible light) | adj | AHD W7 LRC |
| English | redstart | small European songbird with rust-red breast/tail | n | AHD LRC |
| English | rissole | small pastry-enclosed minced meat/fish croquette | n | AHD LRC |
| English | roble | oak of Mexico/California | n | AHD W7 LRC |
| English | roborant | restoring vigor/strength | n | AHD LRC |
| English | robust | vigorous, having/exhibiting strength/health | adj | AHD W7 LRC |
| English | rouge | cosmetic color for lips/cheeks | n | AHD W7 LRC |
| English | roux | cooked mixture of flour/fat | n | AHD W7 LRC |
| English | rowan | Eurasian tree | n | AHD W7 LRC |
| English | rubella | German measles | n | AHD W7 LRC |
| English | rubeola | measles | n | AHD W7 LRC |
| English | rubescent | reddening, turning red | adj | AHD LRC |
| English | rubicund | red, ruddy | adj | AHD W7 LRC |
| English | rubidium | soft silvery metal | n | AHD W7 LRC |
| English | rubiginous | re: rusty red color | adj | AHD W7 LRC |
| English | rubric | heading in book/manuscript done/underlined in different (e.g. red) color | n | AHD W7 LRC |
| English | ruby | precious stone: red corundum | n | AHD W7 LRC |
| English | ruddock | robin | n | AHD W7 LRC |
| English | ruddy | having healthy reddish color | adj | AHD W7 LRC |
| English | rufescent | reddish | adj | AHD W7 LRC |
| English | rufous | reddish | adj | AHD W7 LRC |
| English | russet | coarse homespun reddish brown cloth | n | AHD W7 LRC |
| English | rust | hydrated ferric oxide: brittle reddish coating on iron | n | AHD W7 LRC |
| English | rutilant | having reddish glow | adj | AHD W7 LRC |
| English | rutile | titanium dioxide | n | AHD W7 LRC |
| Old English | rēad | red | adj | W7 LRC |
| Old English | rudduc | ruddock | n | W7 LRC |
| Old English | rudig | ruddy | adj | W7 LRC |
| Old English | rudu | red; redness | adj | W7 ASD LRC |
| Old English | rūst | rust | n.masc | ASD LRC |
| Middle English | red | red | adj | W7 LRC |
| Middle English | rubrike | rubric | n | W7 LRC |
| Middle English | ruby | ruby | n | W7 LRC |
| Middle English | ruddok | ruddock | n | W7 LRC |
| Middle English | rudi | ruddy | adj | W7 LRC |
| Middle English | russet | russet | n | W7 LRC |
| Middle English | rust | rust | n | W7 LRC |
| Middle English | rutilaunt | rutilant | adj | W7 LRC |
| Celtic |
| Old Irish | rūad | red | adj | LRC |
| Welsh | rhudd | red | adj | LRC |
| West Germanic |
| Old Frisian | rād | red | adj | ASD LRC |
| Old Saxon | rōd | red | adj | ASD LRC |
| Old Saxon | rost | rust | n | ASD LRC |
| Old High German | rost | rust | n | ASD LRC |
| Old High German | rōt | red | adj | W7 LRC |
| German | robust | robust | adj | LRC |
| German | Rost | rust | n.masc | LRC |
| German | rot | red | adj | LRC |
| German | Rutil | rutile | n | W7 LRC |
| North Germanic |
| Old Norse | rauðr | red | adj | LRC |
| Old Norse | reynir | rowan | n | W7 LRC |
| Old Norse | rjóða | to redden, make red | vb | LRC |
| Icelandic | rauðr | red | adj | ASD LRC |
| Icelandic | roði | redness | n | ASD LRC |
| East Germanic |
| Gothic | ga-riudei | embarrassment | n | LRC |
| Gothic | rauds | red | adj | ASD LRC |
| Italic |
| Latin | corroboratus | strengthened | vb.ptc | W7 LRC |
| Latin | corroboro, corroborāre | to make strong | vb | W7 LRC |
| Latin | robiginosus | rusty | adj | W7 LRC |
| Latin | rōbīgo, rōbīginis | rust | n.fem | W7 LRC |
| Latin | rōbur, rōboris | oak, hard wood | n.neut | W7 LRC |
| Latin | robustus | oaken, strong | adj | W7 LRC |
| Latin | rubellus | reddish | adj | W7 LRC |
| Latin | rubēns, rubentis | red, ruddy, reddish | adj | W7 LRC |
| Latin | rubeo, rubēre | to be red | vb | W7 LRC |
| Latin | ruber | red | adj | W7 LRC |
| Latin | rubeus | red, reddish | adj | W7 LRC |
| Latin | rubicundus | red, rubicund | adj | W7 LRC |
| Latin | rubidus | red, reddish | adj | W7 LRC |
| Latin | rubiginosus | rusty | adj | W7 LRC |
| Latin | rubrica | rubric, section | n.fem | W7 LRC |
| Latin | rufescens, rufescentis | becoming red/reddish | adj | W7 LRC |
| Latin | rufesco, rufescere | to become red/reddish | vb | W7 LRC |
| Latin | rufus | red, red-haired | adj | W7 LRC |
| Latin | ruger | red | adj | W7 LRC |
| Latin | russus | red | adj | W7 LRC |
| Latin | rutilans, rutilantis | bright (red) | adj | W7 LRC |
| Latin | rutilo, rutilare | to be bright/reddish | vb | W7 LRC |
| Latin | rutilus | red | adj | W7 LRC |
| New Latin | erythema | erythema | n.fem | W7 LRC |
| New Latin | rubella | German measles | n.fem | W7 LRC |
| New Latin | rubeola | measles | n.fem | W7 LRC |
| New Latin | rubeolus | reddish | adj | W7 LRC |
| Spanish | roble | oak | n.masc | W7 LRC |
| American Spanish | roble | oak | n.masc | W7 LRC |
| Old French | rous | russet, red-haired | adj | W7 LRC |
| Old French | rousset | russet, red-haired | adj.dim | W7 LRC |
| Middle French | rouge | red | adj | W7 LRC |
| Middle French | rubis | ruby | n.masc | W7 LRC |
| Middle French | rubrique | rubric | n.fem | W7 LRC |
| French | rouge | red | adj | W7 LRC |
| French | roux | brownish-red, red haired | adj | W7 LRC |
| Balto-Slavic |
| Lithuanian | raũdas | red | adj | LRC |
| Latvian | rûsa | rust | n | LRC |
| Russian | rysyj | red, ruddy | adj | LRC |
| Old Church Slavonic | rudъ | red | adj | LRC |
| Hellenic |
| Homeric Greek | ἐρυθρός | red, ruddy | adj | LRC |
| Greek | erythainein | to redden | vb | W7 LRC |
| Greek | erythēma | red blotch | n | W7 LRC |
| Indo-Iranian |
| Avestan | raoiδita- | red, reddened | adj | LRC |
| Sanskrit | rṓhita- | red, reddened | adj | LRC |
| Tocharian |
| Tocharian B | rätre | red | adj | LRC |
| Tocharian A | rätr- | red | adj | LRC |