From Pre-Germanic *ruh₁mos, an adjectival mo-stem from Proto-Indo-European *rewh₁- (“open space, land”). Related to Tocharian A räw- (“to open”), Avestan 𐬭𐬀𐬎𐬎𐬀𐬵- (rauuah-, “open space”), Latin rūs (“country”), Old Irish róe (“field, open land”), Old Church Slavonic равьнь (ravĭnĭ, “open”).[1]
*rūmaz
- roomy, spacious, open
show ▼Declension of
*rūmaz (a-stem)
Strong declension
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Case
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Masculine
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Feminine
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Neuter
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Singular
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Plural
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Singular
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Plural
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Singular
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Plural
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Nominative
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*rūmaz
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*rūmai
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*rūmō
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*rūmôz
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*rūmą, -atō
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*rūmō
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Accusative
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*rūmanǭ
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*rūmanz
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*rūmǭ
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*rūmōz
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*rūmą, -atō
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*rūmō
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Genitive
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*rūmas, -is
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*rūmaizǫ̂
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*rūmaizōz
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*rūmaizǫ̂
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*rūmas, -is
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*rūmaizǫ̂
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Dative
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*rūmammai
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*rūmaimaz
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*rūmaizōi
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*rūmaimaz
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*rūmammai
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*rūmaimaz
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Instrumental
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*rūmanō
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*rūmaimiz
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*rūmaizō
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*rūmaimiz
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*rūmanō
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*rūmaimiz
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Weak declension
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Case
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Masculine
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Feminine
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Neuter
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Singular
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Plural
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Singular
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Plural
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Singular
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Plural
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Nominative
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*rūmô
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*rūmaniz
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*rūmǭ
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*rūmōniz
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*rūmô
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*rūmōnō
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Accusative
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*rūmanų
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*rūmanunz
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*rūmōnų
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*rūmōnunz
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*rūmô
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*rūmōnō
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Genitive
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*rūminiz
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*rūmanǫ̂
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*rūmōniz
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*rūmōnǫ̂
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*rūminiz
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*rūmanǫ̂
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Dative
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*rūmini
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*rūmammaz
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*rūmōni
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*rūmōmaz
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*rūmini
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*rūmammaz
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Instrumental
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*rūminē
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*rūmammiz
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*rūmōnē
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*rūmōmiz
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*rūminē
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*rūmammiz
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- ^ Guus Kroonen (2013) “*rūma-”, in Alexander Lubotsky, editor, Etymological Dictionary of Proto-Germanic (Leiden Indo-European Etymological Dictionary Series; 11)[1], Leiden, Boston: Brill, →ISBN, page 418