WordReference Random House Unabridged Dictionary of American English © 2025
mi•cro•fos•sil
(mī′krō fos′il),USA pronunciation n.
- Paleontologya fossil so small that it can be studied and identified only with a microscope. Cf. macrofossil.
- micro- + fossil 1920–25
'microfossil' also found in these entries (note: many are not synonyms or translations):