Definition of "menstrual"

Recent studies in physiology have noted that women who live in close proximity to one another - nurses in a hospital or coeds in a college dormitory - tend to have their menstrual periods at the same time.

1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 96

“All that drama for what” I thought. All she had to do was tell me that I was having my menstrual. So much for band aids.

2012, Miryom Willis, Shirley Fisher, Trials, Tragedy, Triumphs, page 11