indicatrix

noun

in·​dica·​trix

¦ində̇¦kā‧triks,

ə̇nˈdikə‧(ˌ)t-

plural -es

: an ellipsoid whose axes are proportional to the principal refractive indices of a crystal and from which various optical properties of the crystal may be deduced

Word History

Etymology

New Latin, feminine of Late Latin indicator

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