Anisian

adjective Anis·ian \ ə-ˈni-zh(ē-)ən , -ˈnē- \

Definition of Anisian

geology
: of, relating to, or being the earliest division of the Middle Triassic lasting from approximately 245 million years ago until 237 million years ago
  • However, vertebrate paleontological evidence, as yet unsupported by palynology, seems to show that some associated sediment of the Fundy Basin probably is even older than Ladinian, referable to the preceding Anisian Stage.
  • —Alfred TraverseScience12 June 1987
— see Geologic Time Table

Anisian

noun
    • The first normal marine gastropod assemblages appeared during the Anisian, at the time of the general reappearance of marine communities.
    • Evolutionary Paleobiology1996

There's more!

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!
Already a subscriber? Log in.

Origin and Etymology of anisian

borrowed from German Anisisch (with-ian replacing German -isch), derivative of Late Latin Anisus, ancient name of the river Enns (alluding to the type locality at Gross-Reifling, in the Enns Valley in Styria, Austria)


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

to provide what is needed to exist

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman-tablet
  • What did focus mean in Latin?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ

Love words? Need even more definitions?

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