Vulnera Sanentur

Vulnera Sanentur[1] was the song-like incantation of a healing spelland counter-curse to the Sectumsempra Spell, both of which were invented by Professor Severus Snape under his alias of "Half-Blood Prince"[3].

Effect
For maximum effect of the spell, the incantation had to be repeated thrice; firstly slowing the flow of blood to prevent death by exsanguination; the second to clear residue and begin to heal the wounds; and the third to fully knit the wounds, although dittany had to be applied to prevent scarring[3].

Known uses

 * Albus Dumbledore healed a wound made to his hand in the Crystal Cave using this spell.
 * Poppy Pomfrey repaired a nasty cut to Harry Potter's shoulder with this after he was attacked by a Hungarian Horntail in the First Task of the Triwizard Tournament[2]
 * When Draco Malfoy was attacked by Harry using Sectumsempra, the damages inflicted were reversed by Severus Snape with his charm[3].

Etymology
Vulnera Sanentur derives from the Latin vulnus, "wound," (in which the roots of the English "vulnerable" may be seen)[4] and sanare, "to heal"; it is translated "may the wounds be healed."[5]

Behind the scenes

 * Body parts that had been completely removed with Sectumsempra could not be restored even using this spell[6].
 * In the book, Harry stayed in the bathroom after cursing Malfoy and witnessed Snape's use of the spell; in the film he ran straight to the common-room.

Appearances

 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)  (First identified as Vulnera Sanentur)