baculum

noun
bac·​u·​lum | \ ˈbak-yə-ləm How to pronounce baculum (audio) \
plural baculums\ -​ləmz How to pronounce baculums (audio) \ or bacula\ -​lə How to pronounce bacula (audio) \

Medical Definition of baculum

: a slender bone reinforcing the penis in many mammals

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