It is a shortened form of "Weblog" which is an online diary or a personal "log" on the web. I wonder if James T. Kirk's Captain's Logs were called clogs. Ooh, interesting fact: "Joe Bloggs" is not a complete sentence, it is the slang term for "any hypothetical person" in the UK.
Well, all of this to say that I am now blogging. Don't be surprised if it doesn't happen often, but I thought it could be fun. After all, I am a writer.
Oh, and may I just say that it is quite easy to source something from dictionary.com because they give you the info in three formats!
"blog." Webster's New Millennium™ Dictionary of English, Preview Edition (v 0.9.7). Lexico Publishing Group, LLC. 13 Aug. 2007.
"blog." Online Etymology Dictionary. Douglas Harper, Historian. 13 Aug. 2007.