Alternate spellings: kelipot, kellipot, klippot, klippoth, qlipoth, qlippoth, and qlifot.
In both Western and Jewish systems of Kabbalah, the ten opposite states of being/aspects of evil/unholy emanations depicted as spheres on the Tree of Death, the other side of the Tree of Life. Plural of qlippah, often translated as husk, peel, or shell, but can also be contemporarily thought of as a shadow. Other synonyms include envelope and cortex.
The ten qliphoth, alternative name if any, and the opposing sephira of the Tree of Life are:
Bonus: Belial is in opposition to Da'ath.