The word "podcast" will now have an entry in the Oxford English Dictionary. Per BBC News:
"Podcast" (digital recording of a radio broadcast made available on the internet for downloading to a personal audio player) is also included.
Though I hope that's not the actual definition they use. Podcasts aren't usually recordings of radio broadcasts, and don't require a personal audio player. It's probably too much to hope that the real definition will mention syndication, too.