From ZooTerms (Dictionary of Invertebrate Zoology)
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fan (noun; Anglo-Saxon fann, fr. Latin vannus, fan): 1. A segment or process flattened and spread triangularly or in a semicircle, appearing fan-like.

2. (Annelida: Polychaeta) The parapodia on the l4th, 15th, or 16th segments.

3. (Cnidaria: Anthozoa) A colony of zooids.

4. A flabellum.