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en.wikipedia.org/wiki/Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina.

always.com/en-us/tips-and-advice/your-first-period/10-common-period-questions

Period questions are so normal – you're not alone! Here are answers to some of the most frequently asked questions.

www.medicalnewstoday.com/articles/154699.php

Dec 12, 2016 ... A period, or menstruation, is the shedding of the endometrium - the lining of the uterus (womb). Menstruation is also known as menses. Menses ...

www.quora.com/What-is-a-girls-period

Your body may be going through a lot of changes, and we bet you have a ton of questions — especially about your period. Knowing more about your changing body ...

www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=289&id=1818

Feb 22, 2016 ... About once a month, afer a girl starts having periods (menstruation), one egg leaves the ovary (ovulation - say ov-u-lay-shun) and travels down ...

www.plannedparenthood.org/learn/health-and-wellness/menstruation

Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens once every month.

kidshealth.org/en/kids/five-period.html

Girls have lots of questions about periods. Here are five good ones - and the all- important answers!

www.ask.com/youtube?q=What+Is+a+Period%3F&v=8kdSORLK5_w
Jul 26, 2012 ... Message me or comment below with questions and requets and I will try my best to respond to all.

www.businessdictionary.com/definition/period.html

Definition of period: A quantifiable segment of time, such as a week, month or quarter that a company uses to forecast or claim business activities. For example, a ...