baculum

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bac·u·lum

 (băk′yə-ləm)
n. pl. bac·u·la or bac·u·lums
The bone of the penis of many mammals, including most rodents, carnivores, and nonhuman primates. Also called os penis.

[New Latin, from Latin, rod, stick; see bak- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

baculum

(ˈbækjʊləm)
n, pl -la (-lə) or -lums
(Zoology) a bony support in the penis of certain mammals, esp the carnivores
[C20: New Latin, from Latin: stick, staff]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014