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.
Start your free trial today and get unlimited access to America's largest dictionary, with:
Share old-man cactus
Cite this Entry
“Old-man cactus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/old-man%20cactus. Accessed 29 Jan. 2022.
See Definitions and Examples »
Get Word of the Day daily email!
Difficult Spelling Words Quiz
Test your visual vocabulary with our 10-question challenge!
A daily challenge for crossword fanatics.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
Words for the shy and bashful
We all want fewer problems and less trouble with ...
'Smatchet', 'Fustilugs', and more
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
Updated with more commonly confused words!
Take the quiz
A warm and toasty quiz to nestle into
Test your visual vocabulary with our 10-question ...