periodoscope
Pe`ri*od"o*scope, n. Etym: [Period + -scope.] (Med.) Defn: A table or other means for calculating the periodical functions of women. Dunglison.
Pe`ri*od"o*scope, n. Etym: [Period + -scope.] (Med.) Defn: A table or other means for calculating the periodical functions of women. Dunglison.