corpus cavernosum

noun
corpus ca·ver·no·sum | \-ˌkav-ər-ˈnō-səm \
plural corpora cavernosa\-sə \

Medical Definition of corpus cavernosum 

: a mass of erectile tissue with large interspaces capable of being distended with blood especially : one of those that form the bulk of the body of the penis or of the clitoris

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