Reference for Niddah 14:2

איזו היא בתולה כל שלא ראתה דם מימיה אע"פ שנשואה

WHO IS REGARDED AS 'VIRGIN'? ANY WOMAN, EVEN THOUGH SHE IS MARRIED, WHO HAS NEVER YET OBSERVED A FLOW. 'A WOMAN IN PREGNANCY'? ONE WHOSE EMBRYO CAN BE DISCERNED. 'A NURSING WOMAN'? A WOMAN BEFORE SHE HAS WEANED HER CHILD. IF SHE GAVE HER CHILD TO A NURSING WOMAN, IF SHE WEANED IT, OR IF IT DIED, R. MEIR RULED: SHE CONVEYS UNCLEANNESS RETROSPECTIVELY FOR TWENTY-FOUR HOURS;<span class="x" onmousemove="('comment',' Preceding the time of her observation of the flow. ');">¹</span>

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