stauroscope

/ ˌstɔːrəˈskɒpɪk; ˈstɔːrəˌskəʊp /

noun

1. obsolete.
   an optical instrument for studying the crystal structure of minerals under polarized light

Derived Forms

• stauroscopic, adjective
• ˌstauroˈscopically, adverb

Word History and Origins

Origin of stauroscope¹

C19: from Greek stauros a cross + -scope

Example Sentences

The "stauroscope", an optical instrument for studying the crystal structure of minerals under polarized light, is also no longer used.

From The Guardian