Board Thread:The Panopticon/@comment-24894325-20170427192340/@comment-1432718-20170428002738

Found it! (patting myself on the back.) From Talk:Time and Relative (novel): "It is easier, as a matter of policy, to simply call everything which is published in a standalone way a 'novel'."

So if it's in an anthology, it's a short story. If it's a standalone, no matter how short, it's a novel.