Aqua Urukto

 Type: Charm

 Pronounced: A-kwa ee-RUCK-toh

 Description: This spell is used to create and control a jet of clear water from the tip of the wand. Probably related to Aguamenti.

 Seen/Mentioned: Used several times to put out fires in 1994.

 Etymology: Aqua means water in Latin. Eructo is a verb meaning "I rise". Roughly translated as "I raise the water".

 Arania exomai

 Arania Exumai HM Talisman Icon

 Type: Charm

 Pronounced: ah-RAHN-ee-a EKS-su-may

 Description: It repels spiders, including acromanthols.

 Seen/Mentioned: Jacob's siblings used this spell to ward off the acromantula that was guarding the forest vault in the Forbidden Forest.

 Etymology: From Latin aranea meaning "spider" and exuo meaning "I sit aside".

 Arresto Momentum

 wandless magic

 Type: Charm

 Pronounced: ah-REST-oh mo-MEN-tum

 Description: Slows down a moving target. Can be used on multiple targets as well as on the caster itself. It was invented in 1711 by Daisy Penifold for use in quaffles in Quidditch.

 Seen/Mentioned: Used by Dumbledore to save one of his students from falling in 1993. Hermione Granger used it to avoid a fatal fall in 1998.

 Etymology: Probably a combination of Anglo-French arester, meaning "to stop," and Latin movere, meaning "force or power gained while moving." The literal translation is therefore to "bring to a stop the force or power gained while moving."