Theridiidae

noun plural
Ther·​i·​di·​idae | \ˌther-ə-ˈdī-ə-ˌdē \

Medical Definition of Theridiidae 

: a family of spiders that includes the genus Latrodectus and comprises those (as the black widow) which spin netlike webs and have usually a small globose body and slender legs

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