keel arch keel • keel line · · · Info · Definitions · Synonyms · Characters · · keel arch · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) a pointed arch having an S-shape on both sides. Synonyms: ogee arch, keel arch. · · Noun Definition 1 Synonyms · · · ogee arch · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 k latin small letter k U+006B l latin small letter l U+006C r latin small letter r U+0072