From Longman Dictionary of Contemporary Englishblack widowˌblack ˈwidow noun [countable] HBIa very poisonous type of spider that is black with red marks
Examples from the Corpus
black widow• There are stories about the ant and a black widow spider.• He was built like a black widow spider, his chest and shoulders so large that it diminished his limbs.• Pepita had been trying to remember the events that led up to being bitten by the black widow spider.• Scientists are now making use of the black widow spider's venom to help them understand disabling human diseases.• The black widow spider and its relatives produce neurotoxins. 