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Patronusmagical effect
A silvery-white, conjured creature created by using the Patronus Charm. The Patronus is used against Dementors and Lethifolds.
Harry's Patronus is a stag (like his father's Animagus form) (PA21, OP1).
Andros the Invincible is alleged to have been the only wizard known to have produced a Patronus the size of a giant (fw)
Aberforth Dumbledore's Patronus is a goat (DH28).
Albus Dumbledore's Patronus is a phoenix (DH20, JKR)
Hermione's Patronus is an otter
and Cho's is a swan (OP27).
Seamus at first wasn't sure what his was, just that it was hairy; it turned out to be a fox (OP27, DH32).
Luna Lovegood's Patronus is a hare (DH32).
Ernie Macmillan's Patronus is a boar (DH32).
Kingsley Shacklebolt's Patronus is a lynx (DH8).
Severus Snape's Patronus is a doe (DH33).
Dolores Umbridge's Patronus is a cat (see) (DH13).
Ron's Patronus is a Jack Russell terrier (JKR, DH32).
Arthur Weasley's Patronus is a weasel (DH7, DH9).
A Patronus can be commanded by the caster to attack. Harry controlled his and told it to attack each Dementor in turn when they attacked him and Dudley in the alley near Privet Drive (OP1).
Members of the Order of the Phoenix used their Patronuses to communicate with other Order members (HBP8, DH8, etc.)