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baculum

/ˈbækjʊləm/
noun (pl) -la (-lə), -lums
1.
a bony support in the penis of certain mammals, esp the carnivores
Word Origin
C20: New Latin, from Latin: stick, staff
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for baculum

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 skeleton. It is found in all insectivores (e.g., shrews, hedgehogs), bats, rodents, and carnivores and in all primates except humans. Such wide distribution suggests that it appeared early in mammalian evolution.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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