Definition of indicatrix in English:

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Pronunciation: /ˈindiˌkātriks/ /inˈdikə-/
(also optical indicatrix)

noun (plural indicatrices /-triˌsēz/)

An imaginary ellipsoidal surface whose axes represent the refractive indices of a crystal for light following different directions with respect to the crystal axes.
Example sentences
  • Other contributions to differential geometry which occur in this work include his invention of the ‘Dupin indicatrix’ which gives an indication of the local behaviour of a surface up to the terms of degree two.


Late 19th century: modern Latin, feminine of Latin indicator 'something that points out'.

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