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hectocotylus

[hek-tuh-kot-l-uh s] /ˌhɛk təˈkɒt l əs/
noun, plural hectocotyli
[hek-tuh-kot-l-ahy] /ˌhɛk təˈkɒt lˌaɪ/ (Show IPA).
Zoology
1.
a modified arm of the male of certain cephalopods that is used to transfer sperm to the female.
Origin
1850-1855
1850-55; < Neo-Latin, equivalent to hecto- hecto- + -cotylus < Greek kotýlē cup
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hectocotyli

hectocotylus

/ˌhɛktəʊˈkɒtɪləs/
noun (pl) -li (-ˌlaɪ)
1.
a tentacle in certain male cephalopod molluscs, such as the octopus, that is specialized for transferring spermatozoa to the female
Word Origin
C19: New Latin, from hecto- + Greek kotulē cup
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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