plural noun
He·​li·​or·​nith·​i·​dae | \-ˌȯrˈnithəˌdē\

Definition of Heliornithidae 

: a family of tropical aquatic birds (order Gruiformes) comprising the sun-grebes and having a head and bill like those of a rail, a long body and tail, short legs, and lobed feet

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History and Etymology for Heliornithidae

New Latin, from Heliornith-, Heliornis, type genus + -idae

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the figure or shape of a crescent moon

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