From ZooTerms (Dictionary of Invertebrate Zoology)
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flagellum (noun; plural flagellums, flagella; Latin flagellum, whip): 1. Any of various whiplike appendages.

2. A protoplasmic process, longer than a cilium, whose movements usually effect locomotion of the cell.

3. The whip-like tip of the male copulatory organ in some invertebrates.

4. (Arthropoda: Crustacea) The multiarticulate distal portion of the antennule, antenna, or exopod.

5. (Arthropoda: Insecta) The distal portion of an insect antenna beyond the second segment (pedicel)

See also: flagellomere. 6. (Porifera) A long projection from a cell, used as a propeller.