Definition of indicatrix in English:

indicatrix

(also optical indicatrix)

Pronunciation: /inˈdikə-//ˈindiˌkātriks/

noun

Crystallography
  • 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.’

Origin

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

Pronunciation:

indicatrix

/inˈdikə-//ˈindiˌkātriks/