index case
n.— «A man whom doctors call the “index case”—the first patient they knew about—got sick in December 2006 and was hospitalized at the Mayo Clinic for about two weeks.» —“A Medical Mystery Unfolds in Minnesota” by Denise Grady in Austin, Minnesota New York Times Feb. 5, 2008. (source: Double-Tongued Dictionary)
Further reading
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
If there’s a logophile on your gift list, you have lots of choices, including a new trivia game for language-lovers and a murder mystery for the word-obsessed. Plus, if someone calls you a schmoozer, should you be flattered or insulted? And if...