straight sinus straight-sided • straight-sliding · · · Info · Definitions · Synonyms · Characters · · straight sinus · · Text Common · · Latin · · Scripts 14 · · Length 3 · · Syllables Definitions · · · (noun) an unpaired sinus of the dura mater. Synonyms: straight sinus, tentorial sinus, sinus rectus. · · Noun Definition 1 Synonyms · · · tentorial sinus · · Synonym 1 sinus rectus · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075