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plural matryoshkas or matryoshki
One of a set of wooden Russian dolls of different sizes, designed such that each fits inside the next. quotations examples
The past is not only a foreign country that we half knew existed; it is hiding another concealed country behind it, and behind that one, another, and another – like a set of Russian matryoshki, in which larger dolls conceal smaller.
2011, Norman Davies, Vanished Kingdoms, Penguin, page 35