Roommate

来自Big Physics
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wiktionary

ref 

room +‎  mate


etymonline

ref

roommate (n.)

also room-mate, "one who shares a room with another or others," 1789, American English, from room (n.) + mate (n.). Short form roomie is by 1918.

取自“https://www.bigphysics.org/index.php?title=Roommate&oldid=25152”