lesser stomach worm
noun
: a small threadlike nematode worm of the genus Ostertagia (O. ostertagi) often present in immense numbers in the pyloric part of a sheep's stomach
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“Lesser stomach worm.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/lesser%20stomach%20worm. Accessed 26 Dec. 2024.
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