MSR noun5 •Mulder/Scully romance; a fanfic involving a romantic relationship between the characters Fox Mulder and Dana Scully of the The X-Files.Although I regard this as a romantic piece, it's not an MSR in the usual sense--our heroes don't ride off into the sunset locked in each other's arms. — 1997 •Initialism of Mars Sample Return mission. •Initialism of main supply route. •Initialism of molten salt reactor. •(slang) Such fan fiction collectively.I am a shipper, and yes, I prefer to read MSR. — 2000 formsMSRs