Duchenne smile
n.— «He knows the difference between Duchenne and non-Duchenne smiles: one crinkles the orbicularis oculi muscles and the other does not. One is genuine and shows in the eyes; the other mostly involves the mouth and looks merely polite. Mr. Keltner has made sure that his smile falls on the right side of that distinction, and that it’s Duchenne all the way.» —“Smiley Faces in Our Chromosomes” by Janet Maslin New York Times Jan. 19, 2009. (source: Double-Tongued Dictionary)
Further reading
Trombonist Benjamin Jacobs-El, who toured with jazz great Lionel Hampton, calls from Huntsville, Alabama, to say that Hampton regularly addressed friends and band members as gate, as in Hey, gates, how’re you doing? Is that because good jazz swings...
What’s the difference between ethics and morality? Between a proverb and an adage? Eli Burnstein’s Dictionary of Fine Distinctions: Nuances, Niceties and Subtle Shades of Meaning (Bookshop|Amazon) helps readers distinguish between such things...