Aspergillum

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An aspergillum (or aspergill) is a tool used to sprinkle holy water. It comes in two common forms: a brush that is dipped in the water and shaken, and a perforated ball at the end of a short handle. Some have internal reservoirs that dispense holy water when shaken, others rely on being dipped in an aspersorium (holy water bucket) periodically.

The aspergillum has also been featured in many role-playing games as a method for fighting the undead, vampires, demons or any other number of mythical creatures traditionally affected by holy water.

Aspergillus, a genus of mold, was named in 1729 by the Italian priest and biologist Pietro Antonio Micheli. When viewed under a microscope, the mold cells were said to resemble an aspergillum.