pas·​sa·​lus | \ ˈpasələs\

Definition of passalus

1 capitalized : the type genus of the family Passalidae
2 plural -es : any beetle of Passalus or a related genus especially : a flat shiny black gregarious bess-bug (Popilius disjunctus) of the southern U.S.

called also horned passalus

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!

History and Etymology for passalus

New Latin, from Greek passalos peg; akin to Greek pēssein to fix, fasten, pēgnynai to fix, fasten

Keep scrolling for more

Comments on passalus

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


to spread over or through

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!