From Middle English roum, from Old English rūm ("room, space"), from Proto-West Germanic *rūm ("room"), from Proto-Germanic *rūmą ("room"), from Proto-Indo-European *rowə- ("free space"). Cognate with Low German Ruum, Dutch ruimte ("space") and Dutch ruim ("cargo load"), German Raum ("space, interior space"), Danish rum ("space, locality"), Norwegian rom ("space"), Swedish rum ("space, location"), and also with Latin rūs ("country, field, farm") through Indo-European. More at rural.
It is ostensibly an exception to the Great Vowel Shift, which otherwise would have produced the pronunciation , but /aʊ/ does not occur before noncoronal consonants in Modern English.
From Middle English roum, rom, rum, from Old English rūm ("roomy, spacious, ample, extensive, large, open, unencumbered, unoccupied, temporal, long, extended, great, liberal, unrestricted, unfettered, clear, loose, free from conditions, free from occupation, not restrained within due limits, lax, far-reaching, abundant, noble, august"), from Proto-Germanic *rūmaz ("roomy, spacious"), from Proto-Indo-European *rewh₁- ("free space"). Cognate with Scots roum ("spacious, roomy"), Dutch ruim ("roomy, spacious, wide"), Danish rum ("wide, spacious"), German raum ("wide"), Icelandic rúmur ("spacious").
From Middle English rome, from Old English rūme ("widely, spaciously, roomily, far and wide, so as to extend over a wide space, liberally, extensively, amply, abundantly, in a high degree, without restriction or encumbrance, without the pressure of care, light-heartedly, without obstruction, plainly, clearly, in detail"). Cognate with Dutch ruim ("amply").
Modern English dictionary
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