One who asperses; a person or device that sprinkles or sprays liquid.
From the verb 'asperse' + agent suffix '-er' (one who does). This noun naturally derives from the verb to name the agent performing the action.
In churches, the asperser (often a priest) holds a special brush or rod called an aspergillum to sprinkle holy water—it's a tool so old that its Latin name is still used in English.
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