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The following 2 entries include the term Beckmann.
Beckmann rearrangement
noun: a rearrangement by which a ketoxime [as the oxime (C6H5)2C:NOH of benzophenone] changes into an amide derivative (such as benzanilide) on treatment usually with phosphorus pentachloride or an acid
Beckmann thermometer
noun: a very sensitive thermometer that has a small range adjustable for any desired values and that is used for determining accurately small differences in temperature (such as the change in freezing point or boiling point of a liquid when some substance is dissolved in it)
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Merriam-Webster unabridged
