a. [f. LILAC + -EOUS.] Of or belonging to a lilac color.

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1855.  in Mayne, Expos. Lex.

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1890.  L. Hearn, in Harper’s Mag., Nov., 862/1. The snow,—a beautiful lilaceous blue. Ibid., 864/2. So far do those forests lie behind the colors of morning, that they seem only lilaceous shadow.

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