gentian violet(redirected from Jenson violet)
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a medicinal preparation that is an anthelmintic and antiseptic agent. Gentian violet is administered internally for helminthic diseases such as enterobiasis and strongyloidiasis, and externally—in solution or salve —for pyoderma, sycosis, and some other skin diseases. Gentian violet is widely used for dyeing preparations in histological and especially in microbiological practice.