From ZooTerms (Dictionary of Invertebrate Zoology)
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supplement (noun; Latin supplere, to fill up): 1. (Arthropoda: Insecta) In Odonata, an adventitious vein formed by a number of crossveins lining up to form a continuous vein behind and more or less parallel to one of the main longitudinal veins.

2. (NEMATA) Variously sized, often paired, papilliform sensory nerve terminations in the male ventral caudal area; genital papillae.