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nannofossil

American  
[nan-uh-fos-uhl] / ˌnæn əˈfɒs əl /

noun

  1. any fossil so small that it is near or below the limit of resolution of a light microscope.

Etymology

Origin of nannofossil

1965–70; nanno- ( def. ) + fossil

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.