ergometrinePronunciation: /ˌəːgə(ʊ)ˈmɛtriːn/Definition of ergometrine noun [mass noun] Chemistry an alkaloid present in ergot. An amide of lysergic acid, it has oxytocic activity and is given to control bleeding after childbirth. Origin: 1930s: from ergot + Greek mētra 'womb' + -ine4ergometrine in other Oxford dictionaries Definition of ergometrine in the US English dictionary