Learn how to say Indicatrices correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word indicatrix:
noun (plural indicatrices /-trɪsiːz/)
an imaginary ellipsoidal surface whose axes represent the refractive indices of a crystal for light following different directions with respect to the crystal axes.
late 19th century: modern Latin, feminine of Latin indicator ‘something that points out’