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 spermatophore sac
Cite this Entry
“Spermatophore sac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spermatophore%20sac. Accessed 16 May. 2022.
See Definitions and Examples »
Get Word of the Day daily email!
Great Words for Scrabble
Test your knowledge - and maybe learn something along the way.
A daily challenge for crossword fanatics.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words and phrases to bear in mind
Along with their degrees of usefulness
These words shouldn't be used interchangeably
When 'thingamajig' and 'thingamabob' just won't do
How to use a word that (literally) drives some pe...
We're intent on clearing it up
Editor Emily Brewster clarifies the difference.
What's with his feathered cap?
Don't be scared to answer these questions about f...
Take the quiz
You don't have to be a NASA engineer to get these...
How many do you know?
The faster you answer, the higher your score