spillway spillproof • spilly · · · Info · Definitions · Synonyms · Characters · · spillway · · Text Latin · · Script 8 · · Length Definitions · · · (noun) a channel that carries excess water over or around a dam or other obstruction. Synonyms: spill, wasteweir. · · Noun Definition 1 Synonyms · · · spill · · Synonym 1 wasteweir · · Synonym 2 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C p latin small letter p U+0070 s latin small letter s U+0073 w latin small letter w U+0077 y latin small letter y U+0079