baculum

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a bone found in the penis of some mammals
(Hayvan Bilim, Zooloji) A slender bone reinforcing the penis in many mammals
(Hayvan Bilim, Zooloji) The baculum (also penis bone, penile bone or os penis) is a bone found in the penis of most mammals. It is absent in humans, equids, marsupials, lagomorphs, and hyenas, amongst others. It is used for copulation and varies in size and shape by species. Its characteristics are sometimes used to differentiate between similar species
{i} small bone in the penis of numerous mammals