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Webster 1913 Edition
Herapathite
Her′a-path-ite
,Noun.
 [Named after Dr. 
Herapath
, the discoverer.] (Chem.) 
The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light. 
Definition 2025
herapathite
herapathite
English
Noun
herapathite (usually uncountable, plural herapathites)
- Iodoquinine sulfate, a chemical compound whose crystals are dichroic and thus can be used for polarizing light.