American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
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Elsewhere on the web
MethodsData from 1607 African American women with invasive breast cancer and 1647 African American control subjects in the Women's Contraceptive and Reproductive Experiences (CARE) Study were used to compute relative and attributable risks that were based on age at menarche, number of affected mother or sisters, and number of previous benign biopsy examinations.— CiteULike: Everyone's library
But, grousing aside (yes, I am on the rag, why do you ask?), for the menarche-ridden,— Bookslut
Age at menarche, an early determinant of breast cancer risk, shows both a downward secular trend and marked differences by socioeconomic status, both presumably the reflection of dietary variations.— CiteULike: Everyone's library
Weight, height, skinfold thickness, mother's age at menarche, and participation in a dance, ballet, gymnastics, or figure skating club were also associated with the early onset of menstruation.— CiteULike: Everyone's library

American Heritage Dictionary (1)
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You can expect to see this word about twice a year.