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nannofossil

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

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

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The rainy weather could not ________ my elated spirits on my graduation day.

Origin of nannofossil

1965–70; nanno- + fossil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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