And their meaning, when I can figure them out. Warning! Spoilers ahead!! If you haven't read these books, look away.
  1. Caput Daconis
    ...And a The Philosopher's Stone. Caput means head. Draconis is the Dragon constellation known as Ursa Major or The Big Dipper. So...Dragon Head. Also, kaput means to stop and Draconi's root is Draco. So...Stop Malfoy!
  2. Pig Snout
    ...And The Philosopher's Stone. This changed while Neville was in the hospital wing after falling off his broom in the first flying lesson. Poor Neville was curled up outside the Gryffindor common room for hours, waiting for someone to come along and tell him the password.
  3. Wattlebird
    ...And The Chamber Of Secrets. A Wattlebird is a bird that has a fleshy appendage hanging down on its neck. Turkeys have a wattle. I think Rowling chose this because Professor Lockhart had removed the bones from Harry's arm, and really, that arm probably behaved about like a wattle.
  4. Fortuna Major
    ...And The Prisoner Of Azkaban. This basically means good luck, or good fortune. Harry was indeed quite fortunate to have Fawkes help him.
  5. Scurvy Cur
    ...And The Prisoner Of Azkaban. The Fat Lady had been attacked and was recovering elsewhere. Sir Cadogan and his fat pony were now guarding the Gryffindor entrance. A cur is a worthless, mongrel dog. Scurvy means despicable. So a despicable, worthless dog. Serious Black.
  6. Oddsbodikins
    ...And The Prisoner Of Azkaban. Sir Cadogan had changed it. Neville had written it down but had lost his note. (He should have saved it as a draft in The List App) Oddsbodikins is a curse, euphemistically meaning God's body. So, goddamnit. This is the password that Serius used to get in. This might have been a curse word that McGonagall would use.
  7. Flibbertigibbet
    ...And The Prisoner Of Azkaban. A Flibbertigibbet is an airhead, or gossipy person. The best explain I have for this is that Neville lost his list of passwords he'd written, and this is an airhead move.
  8. Balderdash
    ...And The Goblet Of Fire. Balderdash means exaggerated talk, or a mixture of liquors. Fred and George have been bragging that they can drink a potion to fool the Goblet Of Fire so they can enter the Tri-Wizard Tournament. Another apt password.
  9. Fairy Lights
    ...And The Goblet Of Fire. This is changed right when Harry unsuccessfully asks Cho Chang to the Yule Ball. On the evening of the Yule Ball as the Durmstrang students come in from their ship there's a grotto filled with fairy lights, made up of actual life fairies lit up.
  10. Larry Fights
    ...And The Goblet Of Fire On Xmas night The Fat Lady and her friend Violet are drunk off of chocolate liquors and she mixes up the password.
  11. Pine Fresh
    ...And The Goblet Of Fire. This isn't the password for the Gryffindor dorm, but for the prefect's bathroom. Cedric gave it to Harry to use the bath. Of course there are many faucets in the prefect's bathroom, and surely one smells of fresh pine.
  12. Banana Fritters
    ...And The Goblet Of Fire. This is when Harry is going out late at night under the invisibility cloak to try to solve the egg problem. Ron comes in at the appointed time for Harry to escape unseen.
  13. Mimbulus mimbletonia
    ...And The order Of The Phoenix. Mimbulus mimbletonia is a plant that Neville Longbottom has that his uncle Algie gave him. One thing this magical plant does is spray stink sap all over the place. His was the only password for the entire book.
  14. Dilligrout
    ...And The Half Blood Prince. Dilligrout is a thick vegetarian soup made for the king on the day of his coronation. Harry is using the "Half-Blood Prince's" copy of Advanced Potion Making. Potions could be like soups and a prince is similar to a king, so I think that's the meaning.
  15. Baubles
    ...And The Half Blood Prince. This is right before Xmas, so quite fitting.
  16. Abstinence
    ...And The Half Blood Prince. This is after returning from Christmas Break, during which The Fat Lady had over indulged.
  17. Tapeworm
    ...And The Half Blood Prince. The best explanation of a connection I can make is that a tapeworm looks vaguely like a memory taken from a wizard's head. This is the password right after Harry gets Professor Slughorn's untainted memory. The Fat Lady is cranky from being woken up and says the password has been changed, but it hadn't really.
  18. Quid Agis
    ...And The Half Blood Prince. This is after Harry has his first of a series of detentions with Professor Snape, during the final quidditch match of the year. Harry couldn't hear the game and was curious about how it went. Quid Agis means "how are you?" or "what do you know?" which is appropriate considering how Harry was feeling.
  19. No password at all...sort of
    ...And The Half Blood Prince. In the second to last chapter, Harry walks back to the Gryffindor common room and the Fat Lady asks if it's true. Harry says "Yes," the Fat Lady wails and opens the door without waiting for a password. So, sort of "no password."
  20. Not a single password involved
    ...And The Deathly Hallows. There was not a single Gryffindor password in the entire book. Harry, Ron and Hermione did not set foot in the Gryffindor dormitory for the entire book.
  21. 18 Gryffindor passwords, and one prefect bathroom password, and one non-password.
  22. I'm really impressed with JK Rowling's ability to use word play. Passwords often sneakily tie in with the story line. Character names are appropriate or humorous, but only if you can make the connection, which sometimes isn't very obvious. I had to look up a lot of words and names and it often made me chuckle.
  23. This is maybe my 7th or 8th time reading the entire series and I liked it even more than ever before. It'll probably be a couple of years before I tackle it again, but man, what a great read.