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dimorphite

[dahy-mawr-fahyt]
noun
  1. a mineral, arsenic sulfide, As4S3, yellow-orange in color and similar in its properties to orpiment.
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Origin of dimorphite

First recorded in 1850–55; dimorph + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018