Definition of endometrium in English:



  • The mucous membrane lining the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.

    • ‘So the uterus prepares itself for an embryo, with an endometrium about 5 mm thick and well supplied with blood.’
    • ‘Just like the normal endometrium, endometrial cells need the hormone oestrogen to survive and grow.’
    • ‘It is vital to get your periods at regular intervals, otherwise it can result in a thickened endometrium.’
    • ‘The lining of the uterus, the endometrium, is shed each month as part of your period.’
    • ‘A third is that successful implantation of the embryo requires the endometrium to be in a particular form that is present only at the beginning of the cycle.’


Late 19th century modern Latin, from endo-‘within’ + Greek mētra ‘womb’.