Sium situs • Siusi · · · Info · Definitions · Characters · · Sium · · Text Latin · · Script 4 · · Length Definitions · · · (noun) perennial of wet and marshy places in the northern hemisphere: water parsnips. Synonyms: genus Sium. · · Noun Definition 1 Characters · · S latin capital letter s U+0053 i latin small letter i U+0069 m latin small letter m U+006D u latin small letter u U+0075