From ZooTerms (Dictionary of Invertebrate Zoology)
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rosettes (noun, plural; Latin diminutive rosa, rose): 1. A process resembling a rose in shape, applied to organs or markings of many invertebrates.

2. (Bryozoa) The clubbed-shaped cells of the funicular system (communication organs).

3. (Echinodermata) Five large ossicles that maintain the shape and width of the suckers on the tube feet; pellions.

4. (NEMATA) Patterns of cuticle surrounding the genital papillae; the uvette of the Demanian vessels.

5. (Platyhelminthes: Cestoda) In Monogenea, elaborately fringed lips on the suckers.