Derived from two words; the Latin lumen, meaning "light," and the Latin solis, meaning "of the sun."
Behind the scenes
- Hermione Granger uses this spell to free Ron Weasley from the Devil's Snare in film adaptation of Harry Potter and the Philosopher's Stone. This was not used in the book, in which she instead frees Harry and Ron with bluebell flames.
- In LEGO Harry Potter: Years 1-4, this spell, as well as its use against Devil's Snare, is taught in a first year Herbology class. This cannot be considered canon, however, because the book states that Professor Sprout only mentioned Devil's Snare in class, not directly covered it.
- Considering the uses to which this spell has been put to, in addition to its etymology, it is not that much of a stretch to assume that it conjures sunlight.