quadrilateral quadrilaminate • quadrilaterally · · · Info · Definitions · Synonyms · Characters · · quadrilateral · · Text Latin · · Script 13 · · Length Definitions · · · (noun) a four-sided polygon. Synonyms: quadrangle, tetragon. · · Noun Definition 1 (adj) having four sides. Synonyms: four-sided. · · Adjective Definition 1 Synonyms · · · quadrangle · · Synonym 1 tetragon · · Synonym 2 four-sided · · Synonym 3 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C q latin small letter q U+0071 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075