tiger
 n.— «In contrast to many cancers, only certain prostate tumors require treatment. Many are slow-growing and pose little threat to health. But separating the “tigers” from the “pussycats”—as oncologists dub them—is tricky.» —“New test pinpoints deadliest prostate cancers” by Ben Hirschler Scientific American July 16, 2007. (source: Double-Tongued Dictionary)

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