[dahy-fen-l-uh-meen, -am-in, -feen-]
noun Chemistry.
a colorless, crystalline, slightly water-soluble benzene derivative, C 12 H 11 N, used chiefly in the preparation of various dyes, as a stabilizer for nitrocellulose propellants, and for the detection of oxidizing agents in analytical chemistry.

1860–65; diphenyl + amine

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World English Dictionary
diphenylamine (daɪˌfiːnaɪləˈmiːn, -ˈæmɪn, -nɪl-, -ˌfɛn-)
a colourless insoluble crystalline derivative of benzene, used in the manufacture of dyes, as a stabilizer in plastics, etc. Formula: (C6H5)2NH

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American Heritage
Medical Dictionary

diphenylamine di·phen·yl·a·mine (dī-fěn'əl-ə-mēn', -ām'ĭn, -fē'nəl-)
A colorless crystalline compound used as a stabilizer for plastics and in the manufacture of dyes, explosives, pesticides, and pharmaceuticals.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Absorption of large amounts of diphenylamine into the body by any route can affect the heart and blood.
Pre-storage treatment of apples with the antioxidant diphenylamine is a common practice for controlling scald.
Neither diphenylamine nor dimethoate have tolerances.
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