au·ran·tia
| \ ȯˈranch(ē)ə \
plural -s
Definition of aurantia
: a poisonous red-brown crystalline alcohol-soluble dye C12H8N8O12 used in biological staining, in desensitizing photographic plates, and in colored photographic filters
—the ammonium salt of hexanitrodiphenylamine
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Merriam-Webster unabridged
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