herapathite

Century Dictionary and Cyclopedia

1. n. A little-used name for a crystalline iodoquinine sulphate used in medicine.

Wiktionary

1. n. Iodoquinine sulfate, a chemical compound whose crystals are dichroic and thus can be used for polarizing light.

GNU Webster's 1913

1. n. (Chem.) The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light.