noun, plural hectocotyli [hek-tuh-kot-l-ahy] . Zoology.
a modified arm of the male of certain cephalopods that is used to transfer sperm to the female.

1850–55; < Neo-Latin, equivalent to hecto- hecto- + -cotylus < Greek kotýlē cup

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World English Dictionary
hectocotylus (ˌhɛktəʊˈkɒtɪləs)
n , pl -li
a tentacle in certain male cephalopod molluscs, such as the octopus, that is specialized for transferring spermatozoa to the female
[C19: New Latin, from hecto- + Greek kotulē cup]

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