A close-fitting, protective cover for a record, typically in the form of a cardboard or paper envelope, and often having on it details about the contents of the record, information about the recording artist, etc.
Origin
1950s; earliest use found in The Washington Post.
Definition of record sleeve in US English:
record sleeve
noun
A close-fitting, protective cover for a record, typically in the form of a cardboard or paper envelope, and often having on it details about the contents of the record, information about the recording artist, etc.