menstrual phase menstrual flow • menstruant · · · Info · Definitions · Characters · · menstrual phase · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) the phase of the menstrual cycle during which the lining of the uterus is shed (the first day of menstrual flow is considered day 1 of the menstrual cycle). Synonyms: menstrual phase. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 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