plural -s
: a niche like a window in the south wall of the sanctuary near the altar (as of a Roman Catholic church) containing the piscina and often also the credence
: a small window or opening like a window (as in an altar front for allowing relics within to be seen)
capitalized [New Latin, from Latin, small window] : a genus (the type of the family Fenestellidae) of Paleozoic bryozoans whose colonies form lacy fronds compare lace bryozoan

Word History


Latin, small opening or window, diminutive of fenestra window

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!

Dictionary Entries Near fenestella

Cite this Entry

“Fenestella.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fenestella. Accessed 4 Dec. 2023.

Love words? Need even more definitions?

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