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.]

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]
References in periodicals archive ?
The penis bone has proven to be a useful structure in taxonomy and systematics (Blair, 1942; Lidicker, 1968; Simson et al., 1995; Pessoa et al., 1998, Bezerra, 2005; Rocha-Barbosa et al., 2013).
According to researchers who studied a collection of penis bones from an extinct species of bear, named Indarctos arctoides, the penis bone size mattered to ancient bears as the females assessed their mates on the basis of their size, Discovery News reported.
If the bladder stones are small, they can also pass into the penile urethra, where they lodge against the os penis bone. This is an emergency situation that you will recognize by the dog's straining and producing little or no urine.