Mo·​non·​chus | \məˈnäŋkəs\

Definition of Mononchus 

: a genus of predatory nematodes (order Chromadorida) usually having a single pharyngeal tooth and living in fresh water and in soil where they have been estimated to number up to 300,000,000 to the acre

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History and Etymology for Mononchus

New Latin, from mon- + -onchus (modification of Greek onkos barbed hook)

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the figure or shape of a crescent moon

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