Entry 1 sense Webster, 1913 Parasiticide /(păr`ȧ*sĭt"ĭ*sīd)/ · Par·a·sit·i·cide · IPA /ˌpæɹəˈsɪtɪsaɪd/ 01 n. Anything used to destroy parasites. 1. Anything used to destroy parasites.