The Collaborative International Dictionary of English v.0.48:

Rosette \Ro*sette\, n. [F., dim. of rose a rose. Cf. Roset.]
   1. An imitation of a rose by means of ribbon or other
      material, -- used as an ornament or a badge.
      [1913 Webster]

   2. (Arch.) An ornament in the form of a rose or roundel,
      -much used in decoration.
      [1913 Webster]

   3. A red color. See Roset.
      [1913 Webster]

   4. A rose burner. See under Rose.
      [1913 Webster]

   5. (Zool.)
      (a) Any structure having a flowerlike form; especially,
          the group of five broad ambulacra on the upper side of
          the spatangoid and clypeastroid sea urchins. See
          Illust. of Spicule, and Sand dollar, under Sand.
      (b) A flowerlike color marking; as, the rosettes on the
          leopard.
          [1913 Webster]

WordNet (r) 3.0 (2006):

rosette
    n 1: an ornament or pattern resembling a rose that is worn as a
         badge of office or as recognition of having won an honor
    2: rhizoctinia disease of potatoes [syn: little potato,
       rosette, russet scab, stem canker]
    3: a cluster of leaves growing in crowded circles from a common
       center or crown (usually at or close to the ground)
    4: circular window filled with tracery [syn: rose window,
       rosette]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "rosette":
   Danish pastry, French pastry, baklava, blintz, chocolate eclair,
   cream puff, dowdy, eclair, pandowdy, pastry, pasty, patisserie,
   patty, patty-shell, pie, puff, quiche, strudel, tart, timbale,
   tipsy cake, trifle, turnover, vol-au-vent



The Free On-line Dictionary of Computing (30 December 2018):

Rosette

    A concurrent object-oriented language from
   MCC.

   [Details?]

   (1997-11-26)