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1. a senior nurse
2. Chiefly RC Church a nun or a title given to a nun
3. a woman fellow member of a Church or religious body
4. Biology denoting any of the cells or cell components formed by division of a parent cell or cell component

What does it mean when you dream about your sister?

To dream of one’s sister is complex because of the complex relationship we usually have with a sibling. It may indicate a union of family or the need to relate to one’s family. This kind of dream can also acknowledge one’s close feelings with others who are like a sister.

References in classic literature ?
Charlotte has won all the prizes," she added, giving her sister-in-law a little pat, which made Lady Otway more uncomfortable still.
He and his sister-in-law were rather tabooed by their neighbors, who seemed to think that they were seen too frequently together--not entirely their fault, for at these times they evidently did not challenge observation.
My sister-in-law is also, I regret to say, indisposed.
But Lady Jane took both the hands of her sister-in-law and kissed her affectionately.
When Oblonsky asked Levin what had brought him to town, Levin blushed, and was furious with himself for blushing, because he could not answer, "I have come to make your sister-in-law an offer," though that was precisely what he had come for.
Recklessly she took a mouthful of the cold tea that had been steeped so long that it was like acid in her mouth, and recklessly, under the eye of her sister-in-law, she swallowed it and the rest of the cupful.