A dilithium hydoxyl is a chemical compound containing dilithium, oxygen, and hydrogen.

In 2152, a Retellian freighter expelled a cloud of dilithium hydroxyls and ionized pyrosulfates into the Enterprise's path, clogging the plasma vents and preventing the Enterprise from engaging its warp drive. (ENT: "Precious Cargo")

The Paulson Nebula is composed of 82% dilithium hydroxyls with magnesium and chromium. This allowed the USS Enterprise-D to use the nebular cloud to hide from the sensors of a Borg cube in 2366. (TNG: "The Best of Both Worlds")

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