Main Entry: men·ar·che Pronunciation: 'men-"är-kE Function: noun : the beginning of the menstrual function; especially: the first menstrual period of an individual —men·ar·che·al/"men-'är-kE-&l/ormen·ar·chal/men-'är-k&l/alsomen·ar·chi·al/men-'är-kE-&l/adjective