Definition of oxytocin in English:


Syllabification: ox·y·to·cin
Pronunciation: /ˌäksəˈtōsən


  • A hormone released by the pituitary gland that causes increased contraction of the uterus during labor and stimulates the ejection of milk into the ducts of the breasts.
    More example sentences
    • Suckling causes the mother's pituitary gland to release two hormones, oxytocin and prolactin.
    • There, hormones called prolactin and oxytocin are released into the bloodstream.
    • The plan was to use a gradually increasing concentration of oxytocin in order to stimulate uterine contractions.


1920s: from Greek oxutokia 'sudden delivery' (from oxus 'sharp' + tokos 'childbirth') + -in1.

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