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red-back spider

American  
[red-bak] / ˈrɛdˌbæk /

noun

  1. a venomous spider, Latrodectus hasselti, of Australia and New Zealand, related to the black widow spider and having a bright red stripe on the back.

Etymology

Origin of red-back spider

First recorded in 1940–45

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.