Definition of hectocotylus
: a modified arm of a male cephalopod that is specially and variously adapted to effect the fertilization of the eggs; especially : an arm that in argonauts and some octopods receives the spermatophores, is inserted into the female mantle cavity, and then is broken free from the body of the male
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Origin and Etymology of hectocotylus
New Latin, from hect- + -cotylus (from Greek kotylē cup, anything hollow) — more at kettle
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