The incantation for the Patronus Charm is "Expecto Patronum!"
View page
it was Snape's patronus
View page
The correct spelling is patronus when referring to the magical
charm
View page
Each person who casts a fully formed patronus will have a
different one which will take the shape of an animal. The animal
will be silver.
View page
Harry's father, James, did. James was an animagus and
transformed into a stag. So Harrys Patronus Charm is a stag, so it
was based off his fathers animagus from.