adjective Aa·le·ni·an \ä-ˈlē-nē-ən\

Definition of Aalenian

  1. :  of, relating to, or being a period of the Middle Jurassic lasting from approximately 176 million years ago until 172 million years ago This applies particularly to the thickest of the sandstones, the Bearreraig Sandstone of Aalenian to Bajocian age. — J. D. Hudson et al., Journal of the Geological Society, September 2011 — see geologic time table


noun Subsequently, during the Aalenian, the motile forms (still present in the water column) had become adapted to life in stressed salinities … — Alister James Powell and J. B. Riding, Recent Developments in Applied Biostratigraphy, 2005

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of aalenian

borrowed from French aalénien, from Aalen, town in Württemberg, Germany, the location of strata defining the period + -ien -ian

First Known Use: 1882

Seen and Heard

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


a trip made at another's expense

Get Word of the Day daily email!