The definition of a hectocotylus is a specific arm of a cephalopod that transfers sperm to the female.
An example of hectocotylus is what a male octopus uses to get a female octopus pregnant.
A modified arm of the male of certain cephalopods, such as most octopuses, functioning as a reproductive organ in transferring sperm to the mantle cavity of the female.
A specific arm of a male octopus, cuttlefish, or other cephalopod, which becomes modified at sexual maturity so that it can transfer sperm to the female.
Origin of hectocotylus
- New Latin hecto– Greek kotulē small cup
From American Heritage Dictionary of the English Language, 5th Edition