Entry 1 sense Webster, 1913 Precipitator · Pre·cip·i·ta·tor · IPA /pɹɪˈsɪpɪˌteɪtə(ɹ)/ 01 n. One who precipitates, or urges on with vehemence or rashness. 1. One who precipitates, or urges on with vehemence or rashness.