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1845, in the meaning defined above
ultimately from Greek diatomos cut in half, from diatemnein to cut through, from dia- + temnein to cut — more at tome
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4 Mar 2021
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“Diatom.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diatom. Accessed 17 Apr. 2021.
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