Copied from the Morgue File site:
"A morgueFile is a place to keep post production materials for use of reference, an inactive job file. This morgueFile contains free high resolution digital stock photography for either corporate or public use.
The term "morgueFile" is popular in the newspaper business to describe the file that holds past issues flats. Although the term has been used by illustrators, comic book artist, designers and teachers as well. The purpose of this site is to provide free image reference material for use in all creative pursuits. This is the world wide web's morgueFile."