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ultramicrotome

[uhl-truh-mahy-kruh-tohm]
noun Histology.
  1. a microtome capable of producing very fine slices of tissue or cellular specimens for electron microscopic examination.
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Origin of ultramicrotome

First recorded in 1945–50; ultra- + microtome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018