[ ˌɒksɪ'təʊsɪn ]
■ noun Biochemistry a hormone released by the pituitary gland that in women causes increased contraction of the womb during labour and stimulates the ejection of milk into the ducts of the breasts.
Origin
1920s: from Gk oxutokia 'sudden delivery' (from oxus 'sharp' + tokos 'childbirth') + -in 1 .