sial siak • sialaden · · · Info · Definitions · Characters · · sial · · Text Latin · · Script 4 · · Length Definitions · · · (noun) the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum. · · Noun Definition 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C s latin small letter s U+0073