ῥαντισμός, -ῦo, ὁ (< ῥαντίζω), [in LXX for נִדָּה ;] sprinkling: of the ceremonial sprinkling of blood for purification, Refs Heb.12:24, 1Pe.1:2 (see Hort, Pe., 23 ff.).† (AS)
Thayer:
1) a sprinkling (purification) 1a) blood of sprinkling 1a1) i.e. appointed for sprinkling (serving to purify)
ῥαντισμός
rhantismos
hran-tis-mos'
From G4472; aspersion (ceremonially or figuratively)