From ZooTerms (Dictionary of Invertebrate Zoology)
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mamelon (noun; French mamelon, protuberance): 1. (Echinodermata: Echinoidea) Terminal knob on the boss that articulates with the spine on the test.

2. (NEMATA: Secernentea) Two or three ventral, serrated projections on the ventral surface of the male of the genus Syphacia; function unknown.