plural noun
Mer·mith·i·dae | \(ˌ)mərˈmithəˌdē\

Definition of Mermithidae 

: a family of elongated round-headed nematode worms (order Enoplida) having the digestive tract nonfunctional in the adult — see mermis

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History and Etymology for Mermithidae

New Latin, from Mermith-, Mermis, type genus + -idae

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