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Pronunciation: ro-zet'


  1. The quartan malarial parasite Plasmodium malariae in its segmented or mature phase.
  2. A grouping of cells characteristic of neoplasms of neuroblastic, neuroectodermal, or ependymal origin; nuclei form a ring from which neurofibrils, which can be demonstrated by silver impregnation, extend to interlace in the center (Homer-Wright rosette); arrangement of ependymal cells around a vessel (perivascular pseudorosette) or around a space or channel (transependymal rosette).
  3. Roselike coiling of the uterus among certain pseudophyllidean tapeworms, such as Diphyllobothrium latum.
  4. Cells of one type surrounding a cell of another type.

[Fr. a little rose]

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