Definition of indicatrix in English:


(also optical indicatrix)

Pronunciation /ˌindəˈkātriks/ /ˌɪndəˈkeɪtrɪks/ /inˈdikətriks/ /ɪnˈdɪkətrɪks/


  • An imaginary ellipsoidal surface whose axes represent the refractive indices of a crystal for light following different directions with respect to the crystal axes.

    • ‘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’.