- heterocotylus
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n. [Gr. hekaton, hundred; kotyle, a cup](MOLLUSCA: Cephalopoda)A penislike process or arm utilized in spermatophore transfer to the mantle cavity of the female, in some species breaking off in the process.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.