1. A long discourse or essay, especially a diatribe.
2. An informal letter, account, or other piece of writing.
Origin
Screed is related to the Old English word for shred.
Quotes
By the time this screed gets to you the drafts may have come, but as I’ve heard nothing yet and been writing for two months now, you’d better have a look anyway. Will you please?
— Ernest Hemingway, Selected Letters