plural noun
Tet·ra·nych·i·dae | \ˌte‧trəˈnikəˌdē\

Definition of Tetranychidae 

: a family of medium-sized soft-bodied mites that have the movable chela of each chelicera modified into a long piercing organ, tenent hairs on the claws, and no genital suckers, that feed on plants and usually spin silken webs over the foliage, and that comprise the economically important red spiders

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History and Etymology for Tetranychidae

New Latin, from Tetranychus, type genus + -idae

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