Definition of black widow in US English:

black widow

(also black widow spider)

noun

  • A highly venomous American spider which has a black body with red markings.

    "Latrodectus mactans", family "Theridiidae"; subspecies also occur on other continents

    • ‘They casually remarked one morning that they'd seen a black widow spider in the tub and washed it down the drain.’
    • ‘First off I had a dream about a spider, a black widow that was the size of a grapefruit that would follow me around like a puppy.’
    • ‘The agency advises anyone who comes into contact with a black widow against touching the spider or its web.’
    • ‘A deadly black widow spider crawled into a shipping crate in the United States and ended its journey some 5,000 miles away in mid-Essex.’
    • ‘It's the female black widow spider that is venomous and displays a menacing red dot on her abdomen.’

Pronunciation

black widow

/ˈˌblæk ˈwɪdoʊ/