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From The Collaborative International Dictionary of English v.0.48:
Violaceous \Vi`o*la"ceous\, a. [L. violaceus, fr. viola a violet.] 1. Resembling violets in color; bluish purple. [1913 Webster] 2. (Bot.) Of or pertaining to a natural order of plants, of which the violet is the type. It contains about twenty genera and two hundred and fifty species. [1913 Webster]