menstrual cycle Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. hormonecontrolled monthly cycle of changes in the female reproductive system that includes the maturation of an egg. Example Sentence The menstrual cycle of the human female averages 28 days. Synonyms female cycle; maturation of an egg; monthly Antonyms male reproductive process Hear It! Say It! Write It! menstrual cycle Switch to cursive Start Share with your friends: