breakthrough bleeding
noun
: an abnormal flow of blood from the uterus that occurs between menstrual periods especially due to irregular sloughing of the endometrium in women on contraceptive hormones
Cite this Entry
“Breakthrough bleeding.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/breakthrough%20bleeding. Accessed 1 Dec. 2025.
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