spermatoxin
noun
sper·ma·tox·in
ˈspər-mə-ˌtäk-sən 
: a substance (as an antibody) poisonous to spermatozoa or derived from spermatozoa and tending to prevent conception
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“Spermatoxin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/spermatoxin. Accessed 23 Nov. 2024.
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