IPA: /ˌæspərˈɡɪləm/
KK: /æspərˈgɪləm/
A tool used in religious ceremonies to sprinkle holy water, often resembling a brush or a small container with holes.
The priest used the aspergillum to bless the congregation with holy water during the service.
Aspergillum is formed from "aspergere" (meaning to sprinkle) and the diminutive suffix "-illum" (indicating a small object). The word refers to a small instrument used for sprinkling water, especially in religious ceremonies.
Think of 'sprinkling' ('aspergere') with a small tool ('-illum') — that's why an aspergillum is used to sprinkle water.