Vulnera Sanentur[1] is a healing spell used to heal injuries ranging from minor cuts to deep gashes. The incantation, which sounds "almost like song" sometimes must be repeated up to three times in a row to have maximum effect.[2] When Severus Snape used this spell to heal Draco Malfoy in 1997, the first time it was used the flow of blood eased up; the second time caused the wounds to knit; the third time removed most visible injuries near-instantly.[2] It is unknown whether the spell always needs to be cast three times, or whether this was a unique situation caused by dark magic. The victim would still require medical treatment, but if dittany is applied immediately, scarring can be avoided.[2]
The incantation of this spell was not mentioned in the book, only referred to as muttering instead.
In the book, Harry stood and saw Snape use the spell on Draco because he was too shocked to be able to move. However, in the movie, Harry ran straight away to the Gryffindor common room.
Etymology
Vulnera Sanentur derives from the Latin vulnus, "wound," [3] and sanare, "to heal"; it is translated "may the wounds be healed."[4]
