a hormone, CHNOS, of the posterior pituitary gland, that stimulates contractions in the smooth muscle of the uterus and facilitates the secretion of milk
Origin of oxytocinfrom oxytocic + -in
- A short polypeptide hormone, C43H66N12O12S2, released from the posterior lobe of the pituitary gland, that stimulates the contraction of smooth muscle of the uterus during labor and facilitates ejection of milk from the breast during nursing.
- A synthetic form of this hormone, used as a drug to induce labor and to control postpartum hemorrhage.
(countable and uncountable, plural oxytocins)
From oxytocic, from Ancient Greek á½€Î¾ÏÏ‚ (oxus, “swift") + Ï„ÏŒÎºÎ¿Ï‚ (tokos, “childbirth"), from Ï„Î¯ÎºÏ„Ï‰ (tiktÅ, “I give birth").