Definition of redback spider
: a theridiid spider (Latrodectus hasselti) that is closely related to the American black widow and probably identical with the katipo, has a venom which produces neurotoxic symptoms in man, and occurs in Australia, New Zealand, and the major islands of the East Indies —called also red-streaked spider
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up redback spider? Please tell us where you read or heard it (including the quote, if possible).