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Pronunciation varies by accent · noun
A microtome that cuts extremely thin slices of tissue, especially for use in electron microscopy..
Use ultramicrotome when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ultramicrotome means A microtome that cuts extremely thin slices of tissue, especially for use in electron microscopy..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ultramicrotome where its definition matches the intended context.
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