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plural aspergilla or aspergillums
(Christianity) An implement, in the form of a brush, or of a rod with a perforated container, for sprinkling holy water; a holy water sprinkler. quotations examples
The king’s authority held sway not only over the knight’s mighty sword, but also over the episcopal cross and aspergillum: for the bishops plied back and forth between court and province like all the other lords.
1994, Emmanuel Le Roy Ladurie, “Introduction: Classic Monarchy”, in Juliet Vale, transl., The Royal French State, 1460-1610, page 6