We found 29 dictionaries that define the word menarche:

General (16 matching dictionaries)

1. menarche: Merriam-Webster
2. menarche: Oxford Learner's Dictionaries
3. menarche: American Heritage Dictionary of the English Language
4. menarche: Collins English Dictionary
5. menarche: Vocabulary.com
6. menarche: Wordnik
7. menarche: Wiktionary
8. menarche: Webster's New World College Dictionary, 4th Ed.
9. menarche: Infoplease Dictionary
10. menarche: Dictionary.com
11. Menarche: Wikipedia, the Free Encyclopedia
12. menarche: Rhymezone
13. menarche: FreeDictionary.org
14. menarche: The Phrontistery - A Dictionary of Obscure Words
15. menarche: Mnemonic Dictionary
16. menarche: TheFreeDictionary.com

Computing (1 matching dictionary)

17. menarche: Encyclopedia

Medicine (10 matching dictionaries)

18. menarche: Merriam-Webster Medical Dictionary
19. Dorland's Illustrated Medical Dictionary (No longer online)
20. Menarche: MedTerms.com Medical Dictionary
21. Medical Dictionary (No longer online)
22. Menarche: Merck Manuals
23. online medical dictionary (No longer online)
24. Menarche: Breast Cancer Glossary of Medical Terms
25. menarche: Medical dictionary
26. University of Maryland Glossary of Medical Terms (No longer online)
27. Menarche: Drug Medical Dictionary

Science (1 matching dictionary)

28. Anthropology dictionary (No longer online)

Slang (1 matching dictionary)

29. menarche: Urban Dictionary

(Note: See menarcheal as well.)

Definitions from Wiktionary (menarche) ▸ noun:  The onset of menstruation; a girl's first period. Similar: menophania, menstrual, menstrue, menstruation, menacme, month, menstrual period, menstration, menstruum, monthly, more... Types: menstruation, menses, period, monthlies, the curse, the rag, the flow, the visitor, more... Adjectives: early, late, delayed, normal, premature, human, spontaneous, precocious, post, average, female Colors:     red,     pink,     burgundy,     scarlet,     crimson, more... ▸ Words similar to menarche ▸ Usage examples for menarche ▸ Idioms related to menarche ▸ Wikipedia articles (New!) ▸ Popular adjectives describing menarche ▸ Words that often appear near menarche ▸ Rhymes of menarche ▸ Invented words related to menarche