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Hectocotylus

Source : Webster's Revised Unabridged Dictionary (1913)

Hectocotylus \Hec`to*cot"y*lus\, n.; pl. {Hectocotyli}. [NL.,
   fr. Gr. ? a hundred + ? a hollow vessel.] (Zo["o]l.)
   One of the arms of the male of most kinds of cephalopods,
   which is specially modified in various ways to effect the
   fertilization of the eggs. In a special sense, the greatly
   modified arm of Argonauta and allied genera, which, after
   receiving the spermatophores, becomes detached from the male,
   and attaches itself to the female for reproductive purposes.
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