from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A female hormone secreted by the corpus luteum that helps soften the cervix and relax the pelvic ligaments in childbirth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A peptide hormone of the insulin superfamily.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. hormone secreted by the corpus luteum during the last days of pregnancy; relaxes the pelvic ligaments and prepares the uterus for labor
relax + -in (Wiktionary)