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The following 2 entries include the term bertrand.
Bertrand curve
noun: either of two twisted curves having the property that the principal normals to one of them are also principal normals to the other
Bertrand lens
noun: an auxiliary removable lens in the tube of a polarizing microscope used to obtain interference figures
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- The business’s new computer system proved not to be a panacea.
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Merriam-Webster unabridged
