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prot·amine | \ ˈprō-tə-ˌmēn 
\
\Definition of protamine
: any of various strongly basic proteins of relatively low molecular weight that are rich in arginine and are found associated especially with DNA in place of histone in the sperm cells of various animals (such as fish)
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protamine
nounprot·amine | \ ˈprōt-ə-ˌmēn \
\Medical Definition of protamine
: any of various strongly basic proteins of relatively low molecular weight that are rich in arginine and are found associated especially with DNA in place of histone in the sperm of various animals (as fish)
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The first known use of protamine was in 1874
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