Aquamenti

Aguamenti (Aguamenti Charm)

 * Pronunciation: ah-gwə-men-tee
 * Description: Produces a jet of water from the caster's wand.
 * Seen/mentioned: First seen in Goblet of Fire, when Fleur put the fire out on her skirt "with a bit of water from her wand." First named in Half-Blood Prince, when Harry is being taught how to perform this specific charm in Professor Flitwick's class. Later Harry casts this spell in an attempt to create water for Dumbledore to drink after taking Voldemort's potion and then to douse Hagrid's hut after it is set on fire later.
 * Suggested etymology: The Latin word aqua (water) combined with augmentum (compare with English augment), an increase, from augere, to increase; see aug- in Indo-European roots, meaning: “increasing the water (flow)”, this combination explains the QU/GU alteration in aqua- →agua- (see agua e. g. in Portuguese and Spanish). -menti is the genitive form of the suffix -mentum