anal sac


Definition of anal sac

: one of the usually paired small pouches of glandular tissue that are located on either side of the anus between the internal and external anal sphincters of various animals (such as dogs, cats, skunks, and foxes) and that discharge often strong-smelling secretions into the anus : anal gland I don't think anyone truly knows why dogs have anal sacs, but the most prominent theory is that they are used as a marking scent. — Jim Berg, News Journal (Wilmington, Delaware), 24 June 2008

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.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of anal sac

1826, in the meaning defined above

Keep scrolling for more

Learn More about anal sac

Statistics for anal sac

Look-up Popularity

Time Traveler for anal sac

The first known use of anal sac was in 1826

See more words from the same year

Comments on anal sac

What made you want to look up anal sac? Please tell us where you read or heard it (including the quote, if possible).


one from the Upper Peninsula of Michigan

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!