aspergillum UK /ˌas.pəˈd͡ʒɪl.əm/US /ˌæs.pəɹˈd͡ʒɪl.əm/ noun1 •An implement, in the form of a brush or of a rod with a perforated container, for sprinkling holy water; a holy-water sprinkle. formsaspergilla · aspergillums