dispell
Without an argument, this command will list all spells you have cast and that are currently active. The list will update as spells are added or removed. It won't list, however, spells someone else has cast on you.

dispell NUMBER
The corresponding spell on that list under that NUMBER will be dispelled. Note that list numbering will be renewed after that.

dispell SPELLNAME
The first spell with a matching SPELLNAME will be dispelled.

dispell ALL
This will dispell all of the spells you are currently using.

dispell SPELLNAME TARGET
This will dispell all the spells you have currently cast on a TARGET.