relaxin

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/rɪˈlæksɪn/US:USA pronunciation: respellingUSA pronunciation: respelling(ri lak′sin)


WordReference Random House Unabridged Dictionary of American English © 2026
re•lax•in  (ri lak′sin),USA pronunciation n. [Biochem., Pharm.]
  1. Biochemistry, Drugsa polypeptide hormone produced by the corpus luteum during pregnancy that causes the pelvic ligaments and cervix to relax during pregnancy and delivery.
  • relax + -in2 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::
relaxin /rɪˈlæksɪn/ n
  1. a mammalian polypeptide hormone secreted by the corpus luteum during pregnancy, which relaxes the pelvic ligaments
  2. a preparation of this hormone, used to facilitate childbirth
Etymology: 20th Century: from relax + -in

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