Bertrand curve

noun
Ber·trand curve | \ ˈber-ˌtränd- , ber-ˈträⁿ- \

Definition of Bertrand curve 

: either of two twisted curves having the property that the principal normals to one of them are also principal normals to the other

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History and Etymology for Bertrand curve

after Joseph L. F. Bertrand †1900 French mathematician

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