- a venomous spider, Latrodectus mactans, widely distributed in the U.S., the female of which is jet-black with an hourglass-shaped red mark on the underside of its abdomen.
Origin of black widow
- an American spider, Latrodectus mactans, the female of which is black with red markings, highly venomous, and commonly eats its mate
type of poisonous spider (Latrodectus mactans) in U.S. South, 1904, so called from its color and from the female's supposed habit of eating the male after mating (they are cannibalistic, but this particular behavior is rare in the wild). Sometimes also known as shoe-button spider. The name black widow is attested earlier (1830s) as a translation of a name of the "scorpion spider" of Central Asia.