noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A peptide hormone of the insulin superfamily. countable, uncountable
2. 2
   hormone secreted by the corpus luteum during the last days of pregnancy; relaxes the pelvic ligaments and prepares the uterus for labor wordnet

Etymology

From relax + -in.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.