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Lat·ro·dec·tus | \ -ˈdek-təs 
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\Medical Definition of Latrodectus
: a genus of nearly cosmopolitan spiders of the family Theridiidae that includes most of the well-known venomous spiders (as the black widow, L. mactans), that are of medium size and dark or black in color and often marked with red, and that have a large globular usually glossy abdomen and long and wiry legs
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