Where does “by-room” come from?

by-room (English) comes from English by, from Middle English by, from Old English bī, from Proto-West Germanic bī, from Proto-Germanic bi, from Proto-Indo-European h₂m̥bʰi, from Proto-Indo-European h₂n̥tbʰi, from Proto-Indo-European h₂énts — on, onto.

by-room (English): An adjoining room or apartment; a side room

Definitions

  1. An adjoining room or apartment; a side room

Ancestry of “by-room”, step by step

by-room traces back through two separate lines of ancestry.

via English by

StepLanguageWordMeaning
1EnglishbyNear or next to; From one side of something to...
2Middle Englishbybe
3Old Englishlullaby!; near, by; by, near, around
4Proto-West Germanicby, at; near, around
5Proto-Germanicbiby, at; near, around
6Proto-Indo-Europeanh₂m̥bʰiaround, on either side of, about; in exchange...
7Proto-Indo-Europeanh₂n̥tbʰi
8Proto-Indo-Europeanh₂éntsforehead; front
9Proto-Indo-Europeanh₂ent-face; forehead; front
10Proto-Indo-Europeanh₂en-on, onto

via English room

StepLanguageWordMeaning
1EnglishroomOpportunity or scope; Space "for" something, or...
2Middle EnglishroumA space or area; A room
3Old Englishrūmroom, space; roomy, spacious, ample, extensive,...
4Proto-West Germanicrūmroomy, spacious; room, open space
5Proto-Germanicrūmazroomy, spacious, open
6Proto-Indo-Europeanrewh₁-free space
Every word from Proto-Indo-European h₂en-Every word from Proto-Indo-European h₂ent-Every word from Proto-Indo-European h₂énts