relaxin
noun
re·lax·in
ri-ˈlak-sən 
: a sex hormone of the corpus luteum that facilitates birth by causing relaxation of the pelvic ligaments
Examples of relaxin in a Sentence
Recent Examples on the Web
This increase in size may be due to the hormone relaxin, which increases during pregnancy, or due to the extra weight gain.
—
Sherri Gordon,
Health,
29 July 2025
Benefits of Placenta Encapsulation The human placenta contains protein, fiber, amino acids, and other nutrients and minerals, as well as hormones like oxytocin, estrogen, progesterone, and relaxin.
—
Christina Montoya Fiedler,
Parents,
14 Jan. 2025
That’s because at six weeks, your joints, including your knees and hips, are still feeling the effects of the hormone relaxin, which is produced during pregnancy.
—
Tiffany Ayuda,
SELF,
6 Oct. 2022
From an athlete’s perspective, an important hormone of note is relaxin, which is produced by the ovaries and the placenta.
—
Hayden Carpenter,
Outside Online,
20 May 2021
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Sherri Gordon,
Health,
29 July 2025
Benefits of Placenta Encapsulation The human placenta contains protein, fiber, amino acids, and other nutrients and minerals, as well as hormones like oxytocin, estrogen, progesterone, and relaxin.
—
Christina Montoya Fiedler,
Parents,
14 Jan. 2025
That’s because at six weeks, your joints, including your knees and hips, are still feeling the effects of the hormone relaxin, which is produced during pregnancy.
—
Tiffany Ayuda,
SELF,
6 Oct. 2022
From an athlete’s perspective, an important hormone of note is relaxin, which is produced by the ovaries and the placenta.
—
Hayden Carpenter,
Outside Online,
20 May 2021
Cite this Entry
“Relaxin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/relaxin. Accessed 3 Jul. 2026.
Copy CitationMedical Definition
relaxin
noun
re·lax·in
ri-ˈlak-sən
: a polypeptide sex hormone of the corpus luteum that facilitates birth by causing relaxation of the pelvic ligaments
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