1. (n) Also known as a babushka doll. A matryoshka doll is Russian nesting doll that decreases in size and are put into another.
2. (n) A Vocaloid song sung by Hatsune Miku and Gumi
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An instrument containing loose bits of colored material (as glass or plastic) between two flat plates and two plane mirrors so placed that changes of position of the bits of material are reflected in an endless variety of patterns
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