Din·​ich·​thys | \ dīˈnikthə̇s \

Definition of Dinichthys

: a genus of large Devonian fishes (subclass Arthrodira) known from both Europe and America and especially abundant in parts of Ohio attaining a length of 30 feet and having the anterior bony armor reduced

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 Dinichthys

borrowed from New Latin, from din- dino- + -ichthys -ichthys

Note: Genus name introduced by the American physician and geologist John Strong Newberry (1822-92) in “On Some Remarkable Fossil Fishes, Discovered by Rev. H. Herzer, in the Black Shale (Devonian) at Delaware, Ohio,” Proceedings of the American Association for the Advancement of Science, Sixteenth Meeting, August, 1867 (Cambridge, Mass., 1868), p. 146: “Dr. Newberry exhibited to the section different portions of the head of a gigantic fish, to which he had given the name of Dinichthys Herzeri, and which, he said, from its size and structure, deserved the same distinction among fishes that Dinotherium and Dinornis enjoy among mammals and birds.”

Keep scrolling for more

Learn More about Dinichthys

Statistics for Dinichthys

Cite this Entry

“Dinichthys.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Dinichthys. Accessed 4 Jun. 2020.

Comments on Dinichthys

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


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!