avermectin
noun
aver·mec·tin
ˌā-vər-ˈmek-tən 
: any of several macrocyclic lactones that are produced by the fermentation of a soil bacterium (Streptomyces avermitilis) and have anthelmintic and insecticidal properties see ivermectin
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“Avermectin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/avermectin. Accessed 27 Nov. 2024.
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