noun Medicine/Medical.
painful menstruation.
Also, dysmenorrhoea.

1800–10; < Neo-Latin; see dys-, menorrhea

dysmenorrheal, adjective
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World English Dictionary
dysmenorrhoea or dysmenorrhea (ˌdɪsmɛnəˈrɪə, dɪsˌmɛn-, ˌdɪsmɛnəˈrɪə, dɪsˌmɛn-)
abnormally difficult or painful menstruation
[C19: from dys- + Greek mēn month + rhoiā a flowing]
dysmenorrhea or dysmenorrhea
[C19: from dys- + Greek mēn month + rhoiā a flowing]
dysmenor'rhoeal or dysmenorrhea
dysmenor'rheal or dysmenorrhea

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

dysmenorrhea dys·men·or·rhe·a or dys·men·or·rhoe·a (dĭs-měn'ə-rē'ə)
A condition marked by painful menstruation. Also called menorrhalgia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dysmenorrhea   (dĭs-měn'ə-rē'ə)  Pronunciation Key 
Painful menstruation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Genetic factors may play a role in primary dysmenorrhea cases.
Being either excessively overweight or underweight can increase the risk for dysmenorrhea and amenorrhea.
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