The baculum (also penis bone, penile bone or os penis) is a bone found in the penis of many placental mammals. It is absent in the human penis, but present in the penises of other primates, such as the gorilla and chimpanzee. The bone is located above the male urethra, and it aids sexual intercourse by maintaining sufficient stiffness during sexua...
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http://en.wikipedia.org/wiki/Baculum
penis bone in some mammals
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http://phrontistery.info/b.html
the penis bone of certain mammals. The baculum is one of several heterotropic skeletal elements—i.e., bones dissociated from the rest of the body ... [2 related articles]
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http://www.britannica.com/eb/a-z/b/4
Synonym: os penis. ... Origin: L. A rod ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(Latin) a walking stick.
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https://www.encyclo.co.uk/local/10135
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