Latrodectus
noun
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