Entry 1 sense Webster, 1913 Stannofluoride /(-flū"ŏr*ĭd [or] -īd)/ · Stan·no·flu·or·ide · IPA 01 n. Any one of a series of double fluorides of tin (stannum) and some other element. 1. Any one of a series of double fluorides of tin (stannum) and some other element.(Chem.)